397551978 has 24 divisors (see below), whose sum is σ = 870246468. Its totient is φ = 131150592.

The previous prime is 397551977. The next prime is 397551983. The reversal of 397551978 is 879155793.

It can be written as a sum of positive squares in 2 ways, for example, as 387420489 + 10131489 = 19683^2 + 3183^2 .

It is not an unprimeable number, because it can be changed into a prime (397551977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 112101 + ... + 115592.

Almost surely, 2^397551978 is an apocalyptic number.

397551978 is an abundant number, since it is smaller than the sum of its proper divisors (472694490).

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

397551978 is a wasteful number, since it uses less digits than its factorization.

397551978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227798 (or 227795 counting only the distinct ones).

The product of its digits is 2381400, while the sum is 54.

The square root of 397551978 is about 19938.7055246824. The cubic root of 397551978 is about 735.3001245519.

The spelling of 397551978 in words is "three hundred ninety-seven million, five hundred fifty-one thousand, nine hundred seventy-eight".