1388815856 has 40 divisors (see below), whose sum is σ = 2715921408. Its totient is φ = 687960000.

The previous prime is 1388815807. The next prime is 1388815889. The reversal of 1388815856 is 6585188831.

It is a junction number, because it is equal to n+sod(n) for n = 1388815798 and 1388815807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1524041 + ... + 1524951.

Almost surely, 2^1388815856 is an apocalyptic number.

1388815856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1388815856 is a deficient number, since it is larger than the sum of its proper divisors (1327105552).

1388815856 is a wasteful number, since it uses less digits than its factorization.

1388815856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1701 (or 1695 counting only the distinct ones).

The product of its digits is 1843200, while the sum is 53.

The square root of 1388815856 is about 37266.8197730904. The cubic root of 1388815856 is about 1115.7020268786.

The spelling of 1388815856 in words is "one billion, three hundred eighty-eight million, eight hundred fifteen thousand, eight hundred fifty-six".