1388816625 has 64 divisors (see below), whose sum is σ = 2651051520. Its totient is φ = 632505600.

The previous prime is 1388816617. The next prime is 1388816687. The reversal of 1388816625 is 5266188831.

1388816625 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1388816625 - 2³ = 1388816617 is a prime.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 831291 + ... + 832959.

It is an arithmetic number, because the mean of its divisors is an integer number (41422680).

Almost surely, 2^1388816625 is an apocalyptic number.

1388816625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1388816625 is a deficient number, since it is larger than the sum of its proper divisors (1262234895).

1388816625 is a wasteful number, since it uses less digits than its factorization.

1388816625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2011 (or 2001 counting only the distinct ones).

The product of its digits is 552960, while the sum is 48.

The square root of 1388816625 is about 37266.8300905779. The cubic root of 1388816625 is about 1115.7022328033.

The spelling of 1388816625 in words is "one billion, three hundred eighty-eight million, eight hundred sixteen thousand, six hundred twenty-five".