397638897028 has 12 divisors (see below), whose sum is σ = 696030042652. Its totient is φ = 198773170560.

The previous prime is 397638896989. The next prime is 397638897041. The reversal of 397638897028 is 820798836793.

It can be written as a sum of positive squares in 2 ways, for example, as 331594008964 + 66044888064 = 575842^2 + 256992^2 .

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, 11550153 + ... + 11584528.

Almost surely, 2^397638897028 is an apocalyptic number.

It is an amenable number.

397638897028 is a deficient number, since it is larger than the sum of its proper divisors (298391145624).

397638897028 is a wasteful number, since it uses less digits than its factorization.

397638897028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23138982 (or 23138980 counting only the distinct ones).

The product of its (nonzero) digits is 219469824, while the sum is 70.

The spelling of 397638897028 in words is "three hundred ninety-seven billion, six hundred thirty-eight million, eight hundred ninety-seven thousand, twenty-eight".