1390904 has 24 divisors (see below), whose sum is σ = 2701440. Its totient is φ = 671328.

The previous prime is 1390903. The next prime is 1390913. The reversal of 1390904 is 4090931.

It is a happy number.

It is a super-2 number, since 2×1390904² = 3869227874432, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1390901) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10889 + ... + 11015.

It is an arithmetic number, because the mean of its divisors is an integer number (112560).

2^1390904 is an apocalyptic number.

It is an amenable number.

1390904 is a deficient number, since it is larger than the sum of its proper divisors (1310536).

1390904 is a wasteful number, since it uses less digits than its factorization.

1390904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207 (or 166 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 1390904 is about 1179.3659313377. The cubic root of 1390904 is about 111.6260915429.

The spelling of 1390904 in words is "one million, three hundred ninety thousand, nine hundred four".