904 has 8 divisors (see below), whose sum is σ = 1710. Its totient is φ = 448.

The previous prime is 887. The next prime is 907. The reversal of 904 is 409.

It is a happy number.

904 is nontrivially palindromic in base 15.

It can be written as a sum of positive squares in only one way, i.e., 900 + 4 = 30^2 + 2^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a pancake number, because a pancake can be divided into 904 parts by 42 straight cuts.

904 is an undulating number in base 15.

It is a plaindrome in base 14 and base 16.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49 + ... + 64.

It is an amenable number.

904 is a deficient number, since it is larger than the sum of its proper divisors (806).

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

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

The sum of its prime factors is 119 (or 115 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 904 is about 30.0665927567. The cubic root of 904 is about 9.6691762542.

Subtracting from 904 its product of nonzero digits (36), we obtain a palindrome (868).

The spelling of 904 in words is "nine hundred four", and thus it is an aban number.