397689620 has 12 divisors (see below), whose sum is σ = 835148244. Its totient is φ = 159075840.

The previous prime is 397689587. The next prime is 397689631. The reversal of 397689620 is 26986793.

It can be written as a sum of positive squares in 2 ways, for example, as 241989136 + 155700484 = 15556^2 + 12478^2 .

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9942221 + ... + 9942260.

It is an arithmetic number, because the mean of its divisors is an integer number (69595687).

Almost surely, 2^397689620 is an apocalyptic number.

It is an amenable number.

397689620 is an abundant number, since it is smaller than the sum of its proper divisors (437458624).

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

397689620 is a wasteful number, since it uses less digits than its factorization.

397689620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19884490 (or 19884488 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 50.

The square root of 397689620 is about 19942.1568542623. The cubic root of 397689620 is about 735.3849742549.

The spelling of 397689620 in words is "three hundred ninety-seven million, six hundred eighty-nine thousand, six hundred twenty".