1388979904 has 84 divisors (see below), whose sum is σ = 3042153936. Its totient is φ = 628712448.

The previous prime is 1388979901. The next prime is 1388979923. The reversal of 1388979904 is 4099798831.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1388979901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 572037 + ... + 574459.

Almost surely, 2^1388979904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1388979904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1521076968).

1388979904 is an abundant number, since it is smaller than the sum of its proper divisors (1653174032).

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

1388979904 is a wasteful number, since it uses less digits than its factorization.

1388979904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2514 (or 2491 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 58.

The square root of 1388979904 is about 37269.0207008448. The cubic root of 1388979904 is about 1115.7459543437.

The spelling of 1388979904 in words is "one billion, three hundred eighty-eight million, nine hundred seventy-nine thousand, nine hundred four".