22118987 has 8 divisors (see below), whose sum is σ = 24175152. Its totient is φ = 20070400.

The previous prime is 22118981. The next prime is 22119001. The reversal of 22118987 is 78981122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22118987 - 2⁸ = 22118731 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22118987.

It is not an unprimeable number, because it can be changed into a prime (22118981) 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, 5483 + ... + 8619.

It is an arithmetic number, because the mean of its divisors is an integer number (3021894).

Almost surely, 2^22118987 is an apocalyptic number.

22118987 is a deficient number, since it is larger than the sum of its proper divisors (2056165).

22118987 is a wasteful number, since it uses less digits than its factorization.

22118987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3789.

The product of its digits is 16128, while the sum is 38.

The square root of 22118987 is about 4703.0827124345. The cubic root of 22118987 is about 280.7081860618.

The spelling of 22118987 in words is "twenty-two million, one hundred eighteen thousand, nine hundred eighty-seven".