1921904 has 20 divisors (see below), whose sum is σ = 3760176. Its totient is φ = 951552.

The previous prime is 1921889. The next prime is 1921919. The reversal of 1921904 is 4091291.

It is an interprime number because it is at equal distance from previous prime (1921889) and next prime (1921919).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1277 + ... + 2339.

2^1921904 is an apocalyptic number.

It is an amenable number.

1921904 is a deficient number, since it is larger than the sum of its proper divisors (1838272).

1921904 is a wasteful number, since it uses less digits than its factorization.

1921904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1184 (or 1178 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 1921904 is about 1386.3275226295. The cubic root of 1921904 is about 124.3303711836.

The spelling of 1921904 in words is "one million, nine hundred twenty-one thousand, nine hundred four".