23691993 has 16 divisors (see below), whose sum is σ = 35810880. Its totient is φ = 13811904.

The previous prime is 23691979. The next prime is 23692003. The reversal of 23691993 is 39919632.

It is a happy number.

It is not a de Polignac number, because 23691993 - 2⁵ = 23691961 is a prime.

It is a super-2 number, since 2×23691993² = 1122621064624098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23691923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15246 + ... + 16727.

It is an arithmetic number, because the mean of its divisors is an integer number (2238180).

Almost surely, 2^23691993 is an apocalyptic number.

It is an amenable number.

23691993 is a deficient number, since it is larger than the sum of its proper divisors (12118887).

23691993 is a wasteful number, since it uses less digits than its factorization.

23691993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32008.

The product of its digits is 78732, while the sum is 42.

The square root of 23691993 is about 4867.4421414127. The cubic root of 23691993 is about 287.2106447290.

It can be divided in two parts, 236 and 91993, that added together give a palindrome (92229).

The spelling of 23691993 in words is "twenty-three million, six hundred ninety-one thousand, nine hundred ninety-three".