397587640 has 32 divisors (see below), whose sum is σ = 899586000. Its totient is φ = 158143744.

The previous prime is 397587629. The next prime is 397587643. The reversal of 397587640 is 46785793.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397587643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20605 + ... + 34924.

Almost surely, 2^397587640 is an apocalyptic number.

It is an amenable number.

397587640 is an abundant number, since it is smaller than the sum of its proper divisors (501998360).

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

397587640 is a wasteful number, since it uses less digits than its factorization.

397587640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55719 (or 55715 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 49.

The square root of 397587640 is about 19939.5997953821. The cubic root of 397587640 is about 735.3221103470.

The spelling of 397587640 in words is "three hundred ninety-seven million, five hundred eighty-seven thousand, six hundred forty".