904021 has 8 divisors (see below), whose sum is σ = 948024. Its totient is φ = 861120.

The previous prime is 904019. The next prime is 904027. The reversal of 904021 is 120409.

It can be written as a sum of positive squares in 4 ways, for example, as 324900 + 579121 = 570^2 + 761^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 904021 - 2¹ = 904019 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 903986 and 904004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (904027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1731 + ... + 2191.

It is an arithmetic number, because the mean of its divisors is an integer number (118503).

2⁹⁰⁴⁰²¹ is an apocalyptic number.

It is an amenable number.

904021 is a deficient number, since it is larger than the sum of its proper divisors (44003).

904021 is a wasteful number, since it uses less digits than its factorization.

904021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 904021 is about 950.8001893142. The cubic root of 904021 is about 96.6925112558.

The spelling of 904021 in words is "nine hundred four thousand, twenty-one".