904993 has 4 divisors (see below), whose sum is σ = 927108. Its totient is φ = 882880.

The previous prime is 904987. The next prime is 904997. The reversal of 904993 is 399409.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 473344 + 431649 = 688^2 + 657^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-904993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (904997) 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 3 ways as a sum of consecutive naturals, for example, 10996 + ... + 11077.

It is an arithmetic number, because the mean of its divisors is an integer number (231777).

2⁹⁰⁴⁹⁹³ is an apocalyptic number.

It is an amenable number.

904993 is a deficient number, since it is larger than the sum of its proper divisors (22115).

904993 is a wasteful number, since it uses less digits than its factorization.

904993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22114.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 904993 is about 951.3112003966. The cubic root of 904993 is about 96.7271533187.

The spelling of 904993 in words is "nine hundred four thousand, nine hundred ninety-three".