22971993 has 16 divisors (see below), whose sum is σ = 33820416. Its totient is φ = 13753040.

The previous prime is 22971989. The next prime is 22971997. The reversal of 22971993 is 39917922.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (22971989) and next prime (22971997).

It is a cyclic number.

It is not a de Polignac number, because 22971993 - 2² = 22971989 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22971997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1455 + ... + 6932.

It is an arithmetic number, because the mean of its divisors is an integer number (2113776).

Almost surely, 2^22971993 is an apocalyptic number.

It is an amenable number.

22971993 is a deficient number, since it is larger than the sum of its proper divisors (10848423).

22971993 is a wasteful number, since it uses less digits than its factorization.

22971993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8484.

The product of its digits is 61236, while the sum is 42.

The square root of 22971993 is about 4792.9107022769. The cubic root of 22971993 is about 284.2712189511.

The spelling of 22971993 in words is "twenty-two million, nine hundred seventy-one thousand, nine hundred ninety-three".