22140018 has 24 divisors (see below), whose sum is σ = 50792508. Its totient is φ = 6945792.

The previous prime is 22139993. The next prime is 22140029. The reversal of 22140018 is 81004122.

It can be written as a sum of positive squares in 2 ways, for example, as 17867529 + 4272489 = 4227^2 + 2067^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35871 + ... + 36482.

Almost surely, 2^22140018 is an apocalyptic number.

22140018 is an abundant number, since it is smaller than the sum of its proper divisors (28652490).

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

22140018 is a wasteful number, since it uses less digits than its factorization.

22140018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72378 (or 72375 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 22140018 is about 4705.3180551372. The cubic root of 22140018 is about 280.7971247910.

The spelling of 22140018 in words is "twenty-two million, one hundred forty thousand, eighteen".