1388939925 has 24 divisors (see below), whose sum is σ = 2302424064. Its totient is φ = 738818560.

The previous prime is 1388939887. The next prime is 1388939977. The reversal of 1388939925 is 5299398831.

It is not a de Polignac number, because 1388939925 - 2¹² = 1388935829 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4549 + ... + 52901.

It is an arithmetic number, because the mean of its divisors is an integer number (95934336).

Almost surely, 2^1388939925 is an apocalyptic number.

1388939925 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1388939925 is a deficient number, since it is larger than the sum of its proper divisors (913484139).

1388939925 is a wasteful number, since it uses less digits than its factorization.

1388939925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48749 (or 48744 counting only the distinct ones).

The product of its digits is 4199040, while the sum is 57.

The square root of 1388939925 is about 37268.4843399889. The cubic root of 1388939925 is about 1115.7352494047.

The spelling of 1388939925 in words is "one billion, three hundred eighty-eight million, nine hundred thirty-nine thousand, nine hundred twenty-five".