1388756945 has 16 divisors (see below), whose sum is σ = 1766033280. Its totient is φ = 1044766464.

The previous prime is 1388756921. The next prime is 1388756977. The reversal of 1388756945 is 5496578831.

It is a cyclic number.

It is not a de Polignac number, because 1388756945 - 2⁶ = 1388756881 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104486 + ... + 117024.

It is an arithmetic number, because the mean of its divisors is an integer number (110377080).

Almost surely, 2^1388756945 is an apocalyptic number.

It is an amenable number.

1388756945 is a deficient number, since it is larger than the sum of its proper divisors (377276335).

1388756945 is a wasteful number, since it uses less digits than its factorization.

1388756945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13864.

The product of its digits is 7257600, while the sum is 56.

The square root of 1388756945 is about 37266.0293699235. The cubic root of 1388756945 is about 1115.6862513167.

The spelling of 1388756945 in words is "one billion, three hundred eighty-eight million, seven hundred fifty-six thousand, nine hundred forty-five".