18972522 has 16 divisors (see below), whose sum is σ = 42161280. Its totient is φ = 6324156.

The previous prime is 18972517. The next prime is 18972529. The reversal of 18972522 is 22527981.

It is not an unprimeable number, because it can be changed into a prime (18972529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175618 + ... + 175725.

It is an arithmetic number, because the mean of its divisors is an integer number (2635080).

Almost surely, 2^18972522 is an apocalyptic number.

18972522 is an abundant number, since it is smaller than the sum of its proper divisors (23188758).

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

18972522 is a wasteful number, since it uses less digits than its factorization.

18972522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351354 (or 351348 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 18972522 is about 4355.7458603550. The cubic root of 18972522 is about 266.7114671258.

The spelling of 18972522 in words is "eighteen million, nine hundred seventy-two thousand, five hundred twenty-two".