1397638488 has 32 divisors (see below), whose sum is σ = 3495674160. Its totient is φ = 465669120.

The previous prime is 1397638477. The next prime is 1397638507. The reversal of 1397638488 is 8848367931.

It is a super-2 number, since 2×1397638488² = 3906786686277852288, which contains 22 as substring.

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, 46656 + ... + 70512.

Almost surely, 2^1397638488 is an apocalyptic number.

It is an amenable number.

1397638488 is an abundant number, since it is smaller than the sum of its proper divisors (2098035672).

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

1397638488 is a wasteful number, since it uses less digits than its factorization.

1397638488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26307 (or 26303 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 57.

The square root of 1397638488 is about 37385.0035174534. The cubic root of 1397638488 is about 1118.0595887138.

The spelling of 1397638488 in words is "one billion, three hundred ninety-seven million, six hundred thirty-eight thousand, four hundred eighty-eight".