18338961 has 4 divisors (see below), whose sum is σ = 24451952. Its totient is φ = 12225972.

The previous prime is 18338951. The next prime is 18338989. The reversal of 18338961 is 16983381.

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 18338961 - 2⁷ = 18338833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18338921) 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, 3056491 + ... + 3056496.

It is an arithmetic number, because the mean of its divisors is an integer number (6112988).

Almost surely, 2^18338961 is an apocalyptic number.

It is an amenable number.

18338961 is a deficient number, since it is larger than the sum of its proper divisors (6112991).

18338961 is an equidigital number, since it uses as much as digits as its factorization.

18338961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6112990.

The product of its digits is 31104, while the sum is 39.

The square root of 18338961 is about 4282.4013123480. The cubic root of 18338961 is about 263.7089739501.

The spelling of 18338961 in words is "eighteen million, three hundred thirty-eight thousand, nine hundred sixty-one".