397009638 has 24 divisors (see below), whose sum is σ = 860925000. Its totient is φ = 132223104.

The previous prime is 397009633. The next prime is 397009673. The reversal of 397009638 is 836900793.

It is a happy number.

397009638 is a `hidden beast` number, since 3 + 9 + 7 + 0 + 0 + 9 + 638 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 397009593 and 397009602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397009631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13653 + ... + 31311.

It is an arithmetic number, because the mean of its divisors is an integer number (35871875).

Almost surely, 2^397009638 is an apocalyptic number.

397009638 is an abundant number, since it is smaller than the sum of its proper divisors (463915362).

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

397009638 is a wasteful number, since it uses less digits than its factorization.

397009638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18916 (or 18913 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 397009638 is about 19925.1007023804. The cubic root of 397009638 is about 734.9656071648.

The spelling of 397009638 in words is "three hundred ninety-seven million, nine thousand, six hundred thirty-eight".