1388904 has 32 divisors (see below), whose sum is σ = 3788640. Its totient is φ = 420800.

The previous prime is 1388887. The next prime is 1388927. The reversal of 1388904 is 4098831.

It is a Harshad number since it is a multiple of its sum of digits (33).

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, 2367 + ... + 2894.

It is an arithmetic number, because the mean of its divisors is an integer number (118395).

2^1388904 is an apocalyptic number.

It is an amenable number.

1388904 is an abundant number, since it is smaller than the sum of its proper divisors (2399736).

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

1388904 is a wasteful number, since it uses less digits than its factorization.

1388904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5281 (or 5277 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 1388904 is about 1178.5177130616. The cubic root of 1388904 is about 111.5725629806.

The spelling of 1388904 in words is "one million, three hundred eighty-eight thousand, nine hundred four".