22231988 has 12 divisors (see below), whose sum is σ = 41194692. Its totient is φ = 10462080.

The previous prime is 22231981. The next prime is 22231997. The reversal of 22231988 is 88913222.

It can be written as a sum of positive squares in 2 ways, for example, as 20322064 + 1909924 = 4508^2 + 1382^2 .

It is a super-2 number, since 2×22231988² = 988522580864288, which contains 22 as substring.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22231981) 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, 163403 + ... + 163538.

It is an arithmetic number, because the mean of its divisors is an integer number (3432891).

Almost surely, 2^22231988 is an apocalyptic number.

It is an amenable number.

22231988 is a deficient number, since it is larger than the sum of its proper divisors (18962704).

22231988 is a wasteful number, since it uses less digits than its factorization.

22231988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326962 (or 326960 counting only the distinct ones).

The product of its digits is 13824, while the sum is 35.

The square root of 22231988 is about 4715.0809112888. The cubic root of 22231988 is about 281.1853996157.

The spelling of 22231988 in words is "twenty-two million, two hundred thirty-one thousand, nine hundred eighty-eight".