23969991 has 8 divisors (see below), whose sum is σ = 31983984. Its totient is φ = 15968000.

The previous prime is 23969971. The next prime is 23969993. The reversal of 23969991 is 19996932.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23969991 - 2¹³ = 23961799 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23969991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23969993) 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 7 ways as a sum of consecutive naturals, for example, 3991 + ... + 7991.

It is an arithmetic number, because the mean of its divisors is an integer number (3997998).

Almost surely, 2^23969991 is an apocalyptic number.

23969991 is a deficient number, since it is larger than the sum of its proper divisors (8013993).

23969991 is a wasteful number, since it uses less digits than its factorization.

23969991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6001.

The product of its digits is 236196, while the sum is 48.

The square root of 23969991 is about 4895.9157468241. The cubic root of 23969991 is about 288.3296403981.

The spelling of 23969991 in words is "twenty-three million, nine hundred sixty-nine thousand, nine hundred ninety-one".