23691889 has 8 divisors (see below), whose sum is σ = 25802280. Its totient is φ = 21622656.

The previous prime is 23691883. The next prime is 23691893. The reversal of 23691889 is 98819632.

It can be written as a sum of positive squares in 4 ways, for example, as 795664 + 22896225 = 892^2 + 4785^2 .

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 23691889 - 2³ = 23691881 is a prime.

It is a super-2 number, since 2×23691889² = 1122611208776642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23691881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9082 + ... + 11395.

It is an arithmetic number, because the mean of its divisors is an integer number (3225285).

Almost surely, 2^23691889 is an apocalyptic number.

It is an amenable number.

23691889 is a deficient number, since it is larger than the sum of its proper divisors (2110391).

23691889 is a wasteful number, since it uses less digits than its factorization.

23691889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20579.

The product of its digits is 186624, while the sum is 46.

The square root of 23691889 is about 4867.4314581718. The cubic root of 23691889 is about 287.2102244752.

The spelling of 23691889 in words is "twenty-three million, six hundred ninety-one thousand, eight hundred eighty-nine".