397892840 has 16 divisors (see below), whose sum is σ = 895258980. Its totient is φ = 159157120.

The previous prime is 397892839. The next prime is 397892849. The reversal of 397892840 is 48298793.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 395452996 + 2439844 = 19886^2 + 1562^2 .

It is not an unprimeable number, because it can be changed into a prime (397892849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4973621 + ... + 4973700.

Almost surely, 2^397892840 is an apocalyptic number.

It is an amenable number.

397892840 is an abundant number, since it is smaller than the sum of its proper divisors (497366140).

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

397892840 is a wasteful number, since it uses less digits than its factorization.

397892840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9947332 (or 9947328 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 50.

The square root of 397892840 is about 19947.2514397347. The cubic root of 397892840 is about 735.5102138711.

The spelling of 397892840 in words is "three hundred ninety-seven million, eight hundred ninety-two thousand, eight hundred forty".