18618822 has 80 divisors (see below), whose sum is σ = 45999360. Its totient is φ = 5602608.

The previous prime is 18618811. The next prime is 18618857. The reversal of 18618822 is 22881681.

18618822 is a `hidden beast` number, since 18 + 618 + 8 + 22 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 70663 + ... + 70925.

It is an arithmetic number, because the mean of its divisors is an integer number (574992).

Almost surely, 2^18618822 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18618822, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22999680).

18618822 is an abundant number, since it is smaller than the sum of its proper divisors (27380538).

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

18618822 is a wasteful number, since it uses less digits than its factorization.

18618822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319 (or 310 counting only the distinct ones).

The product of its digits is 12288, while the sum is 36.

The square root of 18618822 is about 4314.9533021807. The cubic root of 18618822 is about 265.0436477292.

The spelling of 18618822 in words is "eighteen million, six hundred eighteen thousand, eight hundred twenty-two".