23921691 has 8 divisors (see below), whose sum is σ = 32017920. Its totient is φ = 15886632.

The previous prime is 23921683. The next prime is 23921693. The reversal of 23921691 is 19612932.

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

It is not a de Polignac number, because 23921691 - 2³ = 23921683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23921693) 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, 14371 + ... + 15948.

It is an arithmetic number, because the mean of its divisors is an integer number (4002240).

Almost surely, 2^23921691 is an apocalyptic number.

23921691 is a deficient number, since it is larger than the sum of its proper divisors (8096229).

23921691 is a wasteful number, since it uses less digits than its factorization.

23921691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30585.

The product of its digits is 5832, while the sum is 33.

The square root of 23921691 is about 4890.9805765306. The cubic root of 23921691 is about 288.1358468883.

The spelling of 23921691 in words is "twenty-three million, nine hundred twenty-one thousand, six hundred ninety-one".