22929991 has 12 divisors (see below), whose sum is σ = 28243728. Its totient is φ = 18497472.

The previous prime is 22929989. The next prime is 22929997. The reversal of 22929991 is 19992922.

It is not a de Polignac number, because 22929991 - 2¹ = 22929989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22929997) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12931 + ... + 14596.

It is an arithmetic number, because the mean of its divisors is an integer number (2353644).

Almost surely, 2^22929991 is an apocalyptic number.

22929991 is a deficient number, since it is larger than the sum of its proper divisors (5313737).

22929991 is a wasteful number, since it uses less digits than its factorization.

22929991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27558 (or 27551 counting only the distinct ones).

The product of its digits is 52488, while the sum is 43.

The square root of 22929991 is about 4788.5270177791. The cubic root of 22929991 is about 284.0978593860.

The spelling of 22929991 in words is "twenty-two million, nine hundred twenty-nine thousand, nine hundred ninety-one".