1388674639 has 16 divisors (see below), whose sum is σ = 1565254656. Its totient is φ = 1220896800.

The previous prime is 1388674627. The next prime is 1388674709. The reversal of 1388674639 is 9364768831.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1388674639 - 2⁹ = 1388674127 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1388674639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388674039) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57754 + ... + 78184.

It is an arithmetic number, because the mean of its divisors is an integer number (97828416).

Almost surely, 2^1388674639 is an apocalyptic number.

1388674639 is a deficient number, since it is larger than the sum of its proper divisors (176580017).

1388674639 is a wasteful number, since it uses less digits than its factorization.

1388674639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20646.

The product of its digits is 5225472, while the sum is 55.

The square root of 1388674639 is about 37264.9250502399. The cubic root of 1388674639 is about 1115.6642101460.

The spelling of 1388674639 in words is "one billion, three hundred eighty-eight million, six hundred seventy-four thousand, six hundred thirty-nine".