1388279904 has 48 divisors (see below), whose sum is σ = 3975531840. Its totient is φ = 420690560.

The previous prime is 1388279903. The next prime is 1388279911. The reversal of 1388279904 is 4099728831.

1388279904 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388279903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 656274 + ... + 658385.

It is an arithmetic number, because the mean of its divisors is an integer number (82823580).

Almost surely, 2^1388279904 is an apocalyptic number.

It is an amenable number.

1388279904 is an abundant number, since it is smaller than the sum of its proper divisors (2587251936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1388279904 is a wasteful number, since it uses less digits than its factorization.

1388279904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1314683 (or 1314675 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 51.

The square root of 1388279904 is about 37259.6283395312. The cubic root of 1388279904 is about 1115.5584898105.

The spelling of 1388279904 in words is "one billion, three hundred eighty-eight million, two hundred seventy-nine thousand, nine hundred four".