23691887 has 4 divisors (see below), whose sum is σ = 23837400. Its totient is φ = 23546376.

The previous prime is 23691883. The next prime is 23691893. The reversal of 23691887 is 78819632.

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

It is a cyclic number.

It is not a de Polignac number, because 23691887 - 2² = 23691883 is a prime.

It is a super-2 number, since 2×23691887² = 1122611019241538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72512 + ... + 72837.

It is an arithmetic number, because the mean of its divisors is an integer number (5959350).

Almost surely, 2^23691887 is an apocalyptic number.

23691887 is a deficient number, since it is larger than the sum of its proper divisors (145513).

23691887 is a wasteful number, since it uses less digits than its factorization.

23691887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145512.

The product of its digits is 145152, while the sum is 44.

The square root of 23691887 is about 4867.4312527246. The cubic root of 23691887 is about 287.2102163934.

The spelling of 23691887 in words is "twenty-three million, six hundred ninety-one thousand, eight hundred eighty-seven".