397939788 has 72 divisors (see below), whose sum is σ = 1031546880. Its totient is φ = 129289440.

The previous prime is 397939753. The next prime is 397939807. The reversal of 397939788 is 887939793.

It is a happy 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 23 ways as a sum of consecutive naturals, for example, 810223 + ... + 810713.

It is an arithmetic number, because the mean of its divisors is an integer number (14327040).

Almost surely, 2^397939788 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 397939788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (515773440).

397939788 is an abundant number, since it is smaller than the sum of its proper divisors (633607092).

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

397939788 is a wasteful number, since it uses less digits than its factorization.

397939788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1027 (or 1022 counting only the distinct ones).

The product of its digits is 20575296, while the sum is 63.

The square root of 397939788 is about 19948.4282087587. The cubic root of 397939788 is about 735.5391407345.

The spelling of 397939788 in words is "three hundred ninety-seven million, nine hundred thirty-nine thousand, seven hundred eighty-eight".