1321904 has 10 divisors (see below), whose sum is σ = 2561220. Its totient is φ = 660944.

The previous prime is 1321897. The next prime is 1321919. The reversal of 1321904 is 4091231.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41294 + ... + 41325.

It is an arithmetic number, because the mean of its divisors is an integer number (256122).

2^1321904 is an apocalyptic number.

It is an amenable number.

1321904 is a deficient number, since it is larger than the sum of its proper divisors (1239316).

1321904 is an equidigital number, since it uses as much as digits as its factorization.

1321904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82627 (or 82621 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1321904 is about 1149.7408403636. The cubic root of 1321904 is about 109.7488484960.

The spelling of 1321904 in words is "one million, three hundred twenty-one thousand, nine hundred four".