3897540 has 72 divisors (see below), whose sum is σ = 12055680. Its totient is φ = 1018944.

The previous prime is 3897521. The next prime is 3897559. The reversal of 3897540 is 457983.

It is an interprime number because it is at equal distance from previous prime (3897521) and next prime (3897559).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 3897495 and 3897504.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10437 + ... + 10803.

It is an arithmetic number, because the mean of its divisors is an integer number (167440).

Almost surely, 2^3897540 is an apocalyptic number.

3897540 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 3897540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6027840).

3897540 is an abundant number, since it is smaller than the sum of its proper divisors (8158140).

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

3897540 is a wasteful number, since it uses less digits than its factorization.

3897540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441 (or 436 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 3897540 is about 1974.2188328552. The cubic root of 3897540 is about 157.3729890623.

The spelling of 3897540 in words is "three million, eight hundred ninety-seven thousand, five hundred forty".