1388257625 has 16 divisors (see below), whose sum is σ = 1749715344. Its totient is φ = 1099600000.

The previous prime is 1388257613. The next prime is 1388257627. The reversal of 1388257625 is 5267528831.

It can be written as a sum of positive squares in 8 ways, for example, as 546121 + 1387711504 = 739^2 + 37252^2 .

It is not a de Polignac number, because 1388257625 - 2⁸ = 1388257369 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1388257625.

It is not an unprimeable number, because it can be changed into a prime (1388257627) 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, 42356 + ... + 67605.

It is an arithmetic number, because the mean of its divisors is an integer number (109357209).

Almost surely, 2^1388257625 is an apocalyptic number.

It is an amenable number.

1388257625 is a deficient number, since it is larger than the sum of its proper divisors (361457719).

1388257625 is a wasteful number, since it uses less digits than its factorization.

1388257625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110077 (or 110067 counting only the distinct ones).

The product of its digits is 806400, while the sum is 47.

The square root of 1388257625 is about 37259.3293686293. The cubic root of 1388257625 is about 1115.5525223154.

The spelling of 1388257625 in words is "one billion, three hundred eighty-eight million, two hundred fifty-seven thousand, six hundred twenty-five".