1999904 has 12 divisors (see below), whose sum is σ = 3937374. Its totient is φ = 999936.

The previous prime is 1999891. The next prime is 1999957. The reversal of 1999904 is 4099991.

It can be written as a sum of positive squares in only one way, i.e., 1795600 + 204304 = 1340^2 + 452^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31217 + ... + 31280.

2^1999904 is an apocalyptic number.

It is an amenable number.

1999904 is a deficient number, since it is larger than the sum of its proper divisors (1937470).

1999904 is an equidigital number, since it uses as much as digits as its factorization.

1999904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62507 (or 62499 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 1999904 is about 1414.1796208403. The cubic root of 1999904 is about 125.9900890836.

The spelling of 1999904 in words is "one million, nine hundred ninety-nine thousand, nine hundred four".