904721 has 2 divisors, whose sum is σ = 904722. Its totient is φ = 904720.

The previous prime is 904697. The next prime is 904727. The reversal of 904721 is 127409.

904721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 774400 + 130321 = 880^2 + 361^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-904721 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 904721.

It is not a weakly prime, because it can be changed into another prime (904727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 452360 + 452361.

It is an arithmetic number, because the mean of its divisors is an integer number (452361).

2⁹⁰⁴⁷²¹ is an apocalyptic number.

It is an amenable number.

904721 is a deficient number, since it is larger than the sum of its proper divisors (1).

904721 is an equidigital number, since it uses as much as digits as its factorization.

904721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 904721 is about 951.1682290741. The cubic root of 904721 is about 96.7174617439.

The spelling of 904721 in words is "nine hundred four thousand, seven hundred twenty-one".