23412781 has 16 divisors (see below), whose sum is σ = 28827648. Its totient is φ = 18572400.

The previous prime is 23412761. The next prime is 23412787. The reversal of 23412781 is 18721432.

It is not a de Polignac number, because 23412781 - 2⁹ = 23412269 is a prime.

It is a super-2 number, since 2×23412781² = 1096316628307922, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23412787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2646 + ... + 7336.

It is an arithmetic number, because the mean of its divisors is an integer number (1801728).

Almost surely, 2^23412781 is an apocalyptic number.

It is an amenable number.

23412781 is a deficient number, since it is larger than the sum of its proper divisors (5414867).

23412781 is a wasteful number, since it uses less digits than its factorization.

23412781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4752.

The product of its digits is 2688, while the sum is 28.

The square root of 23412781 is about 4838.6755419226. The cubic root of 23412781 is about 286.0779165673.

The spelling of 23412781 in words is "twenty-three million, four hundred twelve thousand, seven hundred eighty-one".