18465921 has 8 divisors (see below), whose sum is σ = 27356960. Its totient is φ = 12310596.

The previous prime is 18465919. The next prime is 18465947. The reversal of 18465921 is 12956481.

It is not a de Polignac number, because 18465921 - 2¹ = 18465919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18465991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 341935 + ... + 341988.

It is an arithmetic number, because the mean of its divisors is an integer number (3419620).

Almost surely, 2^18465921 is an apocalyptic number.

It is an amenable number.

18465921 is a deficient number, since it is larger than the sum of its proper divisors (8891039).

18465921 is an equidigital number, since it uses as much as digits as its factorization.

18465921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683932 (or 683926 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 18465921 is about 4297.1992041329. The cubic root of 18465921 is about 264.3161244078.

The spelling of 18465921 in words is "eighteen million, four hundred sixty-five thousand, nine hundred twenty-one".