22943981 has 4 divisors (see below), whose sum is σ = 22963200. Its totient is φ = 22924764.

The previous prime is 22943957. The next prime is 22943989. The reversal of 22943981 is 18934922.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18934922 = 2 ⋅9467461.

It is a cyclic number.

It is not a de Polignac number, because 22943981 - 2⁶ = 22943917 is a prime.

It is a super-2 number, since 2×22943981² = 1052852528256722, 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 (22943989) 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, 7691 + ... + 10248.

It is an arithmetic number, because the mean of its divisors is an integer number (5740800).

Almost surely, 2^22943981 is an apocalyptic number.

It is an amenable number.

22943981 is a deficient number, since it is larger than the sum of its proper divisors (19219).

22943981 is a wasteful number, since it uses less digits than its factorization.

22943981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19218.

The product of its digits is 31104, while the sum is 38.

The square root of 22943981 is about 4789.9875782720. The cubic root of 22943981 is about 284.1556253778.

The spelling of 22943981 in words is "twenty-two million, nine hundred forty-three thousand, nine hundred eighty-one".