18343881 has 8 divisors (see below), whose sum is σ = 27176160. Its totient is φ = 12229236.

The previous prime is 18343861. The next prime is 18343891. The reversal of 18343881 is 18834381.

It is not a de Polignac number, because 18343881 - 2⁵ = 18343849 is a prime.

It is a super-2 number, since 2×18343881² = 672995940284322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18343861) 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, 339675 + ... + 339728.

It is an arithmetic number, because the mean of its divisors is an integer number (3397020).

Almost surely, 2^18343881 is an apocalyptic number.

It is an amenable number.

18343881 is a deficient number, since it is larger than the sum of its proper divisors (8832279).

18343881 is an equidigital number, since it uses as much as digits as its factorization.

18343881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679412 (or 679406 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 18343881 is about 4282.9757178859. The cubic root of 18343881 is about 263.7325545689.

The spelling of 18343881 in words is "eighteen million, three hundred forty-three thousand, eight hundred eighty-one".