904657993 has 4 divisors (see below), whose sum is σ = 916109440. Its totient is φ = 893206548.

The previous prime is 904657981. The next prime is 904658003. The reversal of 904657993 is 399756409.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 904657993 - 2¹⁷ = 904526921 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 904657993.

It is not an unprimeable number, because it can be changed into a prime (904657933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5725605 + ... + 5725762.

It is an arithmetic number, because the mean of its divisors is an integer number (229027360).

Almost surely, 2^904657993 is an apocalyptic number.

It is an amenable number.

904657993 is a deficient number, since it is larger than the sum of its proper divisors (11451447).

904657993 is a wasteful number, since it uses less digits than its factorization.

904657993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11451446.

The product of its (nonzero) digits is 1837080, while the sum is 52.

The square root of 904657993 is about 30077.5330271617. The cubic root of 904657993 is about 967.1521647766.

The spelling of 904657993 in words is "nine hundred four million, six hundred fifty-seven thousand, nine hundred ninety-three".