18842418 has 24 divisors (see below), whose sum is σ = 46657728. Its totient is φ = 5383512.

The previous prime is 18842413. The next prime is 18842437. The reversal of 18842418 is 81424881.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18842413) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74646 + ... + 74897.

It is an arithmetic number, because the mean of its divisors is an integer number (1944072).

Almost surely, 2^18842418 is an apocalyptic number.

18842418 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18842418 is an abundant number, since it is smaller than the sum of its proper divisors (27815310).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18842418 is a wasteful number, since it uses less digits than its factorization.

18842418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149558 (or 149555 counting only the distinct ones).

The product of its digits is 16384, while the sum is 36.

The square root of 18842418 is about 4340.7854128026. The cubic root of 18842418 is about 266.1004105815.

The spelling of 18842418 in words is "eighteen million, eight hundred forty-two thousand, four hundred eighteen".