397740 has 48 divisors (see below), whose sum is σ = 1274112. Its totient is φ = 90816.

The previous prime is 397729. The next prime is 397751. The reversal of 397740 is 47793.

397740 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (397729) and next prime (397751).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a nialpdrome in base 9.

It is a zygodrome in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 397698 and 397707.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 397740.

It is an unprimeable number.

397740 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54 + ... + 893.

It is an arithmetic number, because the mean of its divisors is an integer number (26544).

2³⁹⁷⁷⁴⁰ is an apocalyptic number.

397740 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 397740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (637056).

397740 is an abundant number, since it is smaller than the sum of its proper divisors (876372).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

397740 is a wasteful number, since it uses less digits than its factorization.

397740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966 (or 964 counting only the distinct ones).

The product of its (nonzero) digits is 5292, while the sum is 30.

The square root of 397740 is about 630.6663143058. Note that the first 3 decimals coincide. The cubic root of 397740 is about 73.5416026218.

The spelling of 397740 in words is "three hundred ninety-seven thousand, seven hundred forty".