18909344 has 24 divisors (see below), whose sum is σ = 37326240. Its totient is φ = 9429696.

The previous prime is 18909337. The next prime is 18909347. The reversal of 18909344 is 44390981.

It is a junction number, because it is equal to n+sod(n) for n = 18909298 and 18909307.

It is not an unprimeable number, because it can be changed into a prime (18909347) 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, 20117 + ... + 21035.

It is an arithmetic number, because the mean of its divisors is an integer number (1555260).

Almost surely, 2^18909344 is an apocalyptic number.

It is an amenable number.

18909344 is a deficient number, since it is larger than the sum of its proper divisors (18416896).

18909344 is an equidigital number, since it uses as much as digits as its factorization.

18909344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1572 (or 1564 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 18909344 is about 4348.4875531614. The cubic root of 18909344 is about 266.4150905128.

The spelling of 18909344 in words is "eighteen million, nine hundred nine thousand, three hundred forty-four".