23978581 has 8 divisors (see below), whose sum is σ = 27296064. Its totient is φ = 20850720.

The previous prime is 23978579. The next prime is 23978599. The reversal of 23978581 is 18587932.

23978581 = T₁₈ + T₁₉ + ... + T₅₂₃.

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

It is not a de Polignac number, because 23978581 - 2¹ = 23978579 is a prime.

It is a super-2 number, since 2×23978581² = 1149944693547122, 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 (23978501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47136 + ... + 47641.

It is an arithmetic number, because the mean of its divisors is an integer number (3412008).

Almost surely, 2^23978581 is an apocalyptic number.

It is an amenable number.

23978581 is a deficient number, since it is larger than the sum of its proper divisors (3317483).

23978581 is a wasteful number, since it uses less digits than its factorization.

23978581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94811.

The product of its digits is 120960, while the sum is 43.

The square root of 23978581 is about 4896.7929300717. The cubic root of 23978581 is about 288.3640786784.

The spelling of 23978581 in words is "twenty-three million, nine hundred seventy-eight thousand, five hundred eighty-one".