23672991 has 4 divisors (see below), whose sum is σ = 31563992. Its totient is φ = 15781992.

The previous prime is 23672981. The next prime is 23673029. The reversal of 23672991 is 19927632.

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

It is not a de Polignac number, because 23672991 - 2⁷ = 23672863 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 (23672921) 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, 3945496 + ... + 3945501.

It is an arithmetic number, because the mean of its divisors is an integer number (7890998).

Almost surely, 2^23672991 is an apocalyptic number.

23672991 is a deficient number, since it is larger than the sum of its proper divisors (7891001).

23672991 is an equidigital number, since it uses as much as digits as its factorization.

23672991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7891000.

The product of its digits is 40824, while the sum is 39.

The square root of 23672991 is about 4865.4898006264. The cubic root of 23672991 is about 287.1338390843.

The spelling of 23672991 in words is "twenty-three million, six hundred seventy-two thousand, nine hundred ninety-one".