22238981 has 4 divisors (see below), whose sum is σ = 22325772. Its totient is φ = 22152192.

The previous prime is 22238971. The next prime is 22239001. The reversal of 22238981 is 18983222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11282881 + 10956100 = 3359^2 + 3310^2 .

It is a cyclic number.

It is not a de Polignac number, because 22238981 - 2¹⁴ = 22222597 is a prime.

It is a super-2 number, since 2×22238981² = 989144551836722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22238921) 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, 43010 + ... + 43523.

It is an arithmetic number, because the mean of its divisors is an integer number (5581443).

Almost surely, 2^22238981 is an apocalyptic number.

It is an amenable number.

22238981 is a deficient number, since it is larger than the sum of its proper divisors (86791).

22238981 is an equidigital number, since it uses as much as digits as its factorization.

22238981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86790.

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

The square root of 22238981 is about 4715.8224097182. The cubic root of 22238981 is about 281.2148785115.

The spelling of 22238981 in words is "twenty-two million, two hundred thirty-eight thousand, nine hundred eighty-one".