18718722 has 32 divisors (see below), whose sum is σ = 45380160. Its totient is φ = 5672160.

The previous prime is 18718709. The next prime is 18718723. The reversal of 18718722 is 22781781.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18718723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15163 + ... + 16350.

It is an arithmetic number, because the mean of its divisors is an integer number (1418130).

Almost surely, 2^18718722 is an apocalyptic number.

18718722 is an abundant number, since it is smaller than the sum of its proper divisors (26661438).

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

18718722 is a wasteful number, since it uses less digits than its factorization.

18718722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31535 (or 31529 counting only the distinct ones).

The product of its digits is 12544, while the sum is 36.

The square root of 18718722 is about 4326.5138391088. The cubic root of 18718722 is about 265.5168363673.

It can be divided in two parts, 187187 and 22, that multiplied together give a palindrome (4118114).

The spelling of 18718722 in words is "eighteen million, seven hundred eighteen thousand, seven hundred twenty-two".