904921 has 4 divisors (see below), whose sum is σ = 934144. Its totient is φ = 875700.

The previous prime is 904919. The next prime is 904931. The reversal of 904921 is 129409.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 904921 - 2¹ = 904919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (904901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14565 + ... + 14626.

It is an arithmetic number, because the mean of its divisors is an integer number (233536).

2⁹⁰⁴⁹²¹ is an apocalyptic number.

It is an amenable number.

904921 is a deficient number, since it is larger than the sum of its proper divisors (29223).

904921 is a wasteful number, since it uses less digits than its factorization.

904921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29222.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 904921 is about 951.2733571377. The cubic root of 904921 is about 96.7245880908.

The spelling of 904921 in words is "nine hundred four thousand, nine hundred twenty-one".