1961730 has 48 divisors (see below), whose sum is σ = 5189184. Its totient is φ = 514080.

The previous prime is 1961683. The next prime is 1961737. The reversal of 1961730 is 371691.

1961730 is a `hidden beast` number, since 19 + 617 + 30 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1961694 and 1961703.

It is not an unprimeable number, because it can be changed into a prime (1961737) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6237 + ... + 6543.

It is an arithmetic number, because the mean of its divisors is an integer number (108108).

2^1961730 is an apocalyptic number.

1961730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1961730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2594592).

1961730 is an abundant number, since it is smaller than the sum of its proper divisors (3227454).

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

1961730 is a wasteful number, since it uses less digits than its factorization.

1961730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391 (or 388 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 27.

The square root of 1961730 is about 1400.6177208646. The cubic root of 1961730 is about 125.1833043979.

The spelling of 1961730 in words is "one million, nine hundred sixty-one thousand, seven hundred thirty".