22639940 has 12 divisors (see below), whose sum is σ = 47543916. Its totient is φ = 9055968.

The previous prime is 22639931. The next prime is 22639943. The reversal of 22639940 is 4993622.

It can be written as a sum of positive squares in 2 ways, for example, as 11999296 + 10640644 = 3464^2 + 3262^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 22639940.

It is not an unprimeable number, because it can be changed into a prime (22639943) 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, 565979 + ... + 566018.

It is an arithmetic number, because the mean of its divisors is an integer number (3961993).

Almost surely, 2^22639940 is an apocalyptic number.

22639940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22639940 is an abundant number, since it is smaller than the sum of its proper divisors (24903976).

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

22639940 is a wasteful number, since it uses less digits than its factorization.

22639940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132006 (or 1132004 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 22639940 is about 4758.1445963737. The cubic root of 22639940 is about 282.8948820266.

The spelling of 22639940 in words is "twenty-two million, six hundred thirty-nine thousand, nine hundred forty".