7904491 has 4 divisors (see below), whose sum is σ = 9033712. Its totient is φ = 6775272.

The previous prime is 7904483. The next prime is 7904509. The reversal of 7904491 is 1944097.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1944097 = 41 ⋅47417.

It is not a de Polignac number, because 7904491 - 2³ = 7904483 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (7904471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 564600 + ... + 564613.

It is an arithmetic number, because the mean of its divisors is an integer number (2258428).

Almost surely, 2^7904491 is an apocalyptic number.

7904491 is a deficient number, since it is larger than the sum of its proper divisors (1129221).

7904491 is a wasteful number, since it uses less digits than its factorization.

7904491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129220.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 7904491 is about 2811.4926640488. The cubic root of 7904491 is about 199.2009031399.

The spelling of 7904491 in words is "seven million, nine hundred four thousand, four hundred ninety-one".