1397887928 has 32 divisors (see below), whose sum is σ = 2829319200. Its totient is φ = 645499008.

The previous prime is 1397887919. The next prime is 1397887943. The reversal of 1397887928 is 8297887931.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125651 + ... + 136322.

It is an arithmetic number, because the mean of its divisors is an integer number (88416225).

Almost surely, 2^1397887928 is an apocalyptic number.

It is an amenable number.

1397887928 is an abundant number, since it is smaller than the sum of its proper divisors (1431431272).

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

1397887928 is a wasteful number, since it uses less digits than its factorization.

1397887928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262031 (or 262027 counting only the distinct ones).

The product of its digits is 12192768, while the sum is 62.

The square root of 1397887928 is about 37388.3394656676. The cubic root of 1397887928 is about 1118.1260990445.

The spelling of 1397887928 in words is "one billion, three hundred ninety-seven million, eight hundred eighty-seven thousand, nine hundred twenty-eight".