23185981 has 8 divisors (see below), whose sum is σ = 28536704. Its totient is φ = 18344880.

The previous prime is 23185961. The next prime is 23185999. The reversal of 23185981 is 18958132.

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 23185981 - 2⁷ = 23185853 is a prime.

It is a super-2 number, since 2×23185981² = 1075179429864722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 23185981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23185931) 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 7 ways as a sum of consecutive naturals, for example, 127305 + ... + 127486.

It is an arithmetic number, because the mean of its divisors is an integer number (3567088).

Almost surely, 2^23185981 is an apocalyptic number.

It is an amenable number.

23185981 is a deficient number, since it is larger than the sum of its proper divisors (5350723).

23185981 is a wasteful number, since it uses less digits than its factorization.

23185981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254811.

The product of its digits is 17280, while the sum is 37.

The square root of 23185981 is about 4815.1823433802. The cubic root of 23185981 is about 285.1511704428.

The spelling of 23185981 in words is "twenty-three million, one hundred eighty-five thousand, nine hundred eighty-one".