904221 has 6 divisors (see below), whose sum is σ = 1306110. Its totient is φ = 602808.

The previous prime is 904219. The next prime is 904261. The reversal of 904221 is 122409.

It can be written as a sum of positive squares in only one way, i.e., 881721 + 22500 = 939^2 + 150^2 .

It is not a de Polignac number, because 904221 - 2¹ = 904219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 904194 and 904203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (904201) 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 5 ways as a sum of consecutive naturals, for example, 50226 + ... + 50243.

It is an arithmetic number, because the mean of its divisors is an integer number (217685).

2⁹⁰⁴²²¹ is an apocalyptic number.

It is an amenable number.

904221 is a deficient number, since it is larger than the sum of its proper divisors (401889).

904221 is a wasteful number, since it uses less digits than its factorization.

904221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100475 (or 100472 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 904221 is about 950.9053580667. The cubic root of 904221 is about 96.6996412806.

The spelling of 904221 in words is "nine hundred four thousand, two hundred twenty-one".