397520978 has 8 divisors (see below), whose sum is σ = 596424972. Its totient is φ = 198712656.

The previous prime is 397520927. The next prime is 397521001. The reversal of 397520978 is 879025793.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 283821409 + 113699569 = 16847^2 + 10663^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12425 + ... + 30812.

Almost surely, 2^397520978 is an apocalyptic number.

397520978 is a deficient number, since it is larger than the sum of its proper divisors (198903994).

397520978 is a wasteful number, since it uses less digits than its factorization.

397520978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47836.

The product of its (nonzero) digits is 952560, while the sum is 50.

The square root of 397520978 is about 19937.9281270648. The cubic root of 397520978 is about 735.2810118340.

The spelling of 397520978 in words is "three hundred ninety-seven million, five hundred twenty thousand, nine hundred seventy-eight".