22166840 has 16 divisors (see below), whose sum is σ = 49875480. Its totient is φ = 8866720.

The previous prime is 22166819. The next prime is 22166843. The reversal of 22166840 is 4866122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22166843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 277046 + ... + 277125.

Almost surely, 2^22166840 is an apocalyptic number.

22166840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22166840 is an abundant number, since it is smaller than the sum of its proper divisors (27708640).

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

22166840 is a wasteful number, since it uses less digits than its factorization.

22166840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554182 (or 554178 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 22166840 is about 4708.1673717063. The cubic root of 22166840 is about 280.9104715990.

The spelling of 22166840 in words is "twenty-two million, one hundred sixty-six thousand, eight hundred forty".