18500022 has 16 divisors (see below), whose sum is σ = 41111280. Its totient is φ = 6166656.

The previous prime is 18500017. The next prime is 18500039. The reversal of 18500022 is 22000581.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 18499968 and 18500004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171243 + ... + 171350.

It is an arithmetic number, because the mean of its divisors is an integer number (2569455).

Almost surely, 2^18500022 is an apocalyptic number.

18500022 is an abundant number, since it is smaller than the sum of its proper divisors (22611258).

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

18500022 is a wasteful number, since it uses less digits than its factorization.

18500022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342604 (or 342598 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 18500022 is about 4301.1651909686. The cubic root of 18500022 is about 264.4787284730.

The spelling of 18500022 in words is "eighteen million, five hundred thousand, twenty-two".