23981665 has 8 divisors (see below), whose sum is σ = 28810368. Its totient is φ = 19163760.

The previous prime is 23981647. The next prime is 23981687. The reversal of 23981665 is 56618932.

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

It is a de Polignac number, because none of the positive numbers 2^k-23981665 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3480 + ... + 7750.

It is an arithmetic number, because the mean of its divisors is an integer number (3601296).

Almost surely, 2^23981665 is an apocalyptic number.

It is an amenable number.

23981665 is a deficient number, since it is larger than the sum of its proper divisors (4828703).

23981665 is a wasteful number, since it uses less digits than its factorization.

23981665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5399.

The product of its digits is 77760, while the sum is 40.

The square root of 23981665 is about 4897.1078199280. The cubic root of 23981665 is about 288.3764407763.

The spelling of 23981665 in words is "twenty-three million, nine hundred eighty-one thousand, six hundred sixty-five".