1388880657 has 12 divisors (see below), whose sum is σ = 2010286720. Its totient is φ = 924016248.

The previous prime is 1388880547. The next prime is 1388880667. The reversal of 1388880657 is 7560888831.

It is a happy number.

It is not a de Polignac number, because 1388880657 - 2¹⁴ = 1388864273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1388880667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 154057 + ... + 162822.

Almost surely, 2^1388880657 is an apocalyptic number.

It is an amenable number.

1388880657 is a deficient number, since it is larger than the sum of its proper divisors (621406063).

1388880657 is a wasteful number, since it uses less digits than its factorization.

1388880657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317372 (or 317369 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 54.

The square root of 1388880657 is about 37267.6891824540. The cubic root of 1388880657 is about 1115.7193791869.

The spelling of 1388880657 in words is "one billion, three hundred eighty-eight million, eight hundred eighty thousand, six hundred fifty-seven".