1521904 has 20 divisors (see below), whose sum is σ = 2991376. Its totient is φ = 749952.

The previous prime is 1521901. The next prime is 1521913. The reversal of 1521904 is 4091251.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1521901) by changing a digit.

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, 517 + ... + 1819.

2^1521904 is an apocalyptic number.

It is an amenable number.

1521904 is a deficient number, since it is larger than the sum of its proper divisors (1469472).

1521904 is a wasteful number, since it uses less digits than its factorization.

1521904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1384 (or 1378 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 1521904 is about 1233.6547328973. The cubic root of 1521904 is about 115.0259298808.

The spelling of 1521904 in words is "one million, five hundred twenty-one thousand, nine hundred four".