23129856 has 54 divisors (see below), whose sum is σ = 66695720. Its totient is φ = 7709184.

The previous prime is 23129851. The next prime is 23129861. The reversal of 23129856 is 65892132.

It is an interprime number because it is at equal distance from previous prime (23129851) and next prime (23129861).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 23129856.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23129851) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2716 + ... + 7323.

Almost surely, 2^23129856 is an apocalyptic number.

It is an amenable number.

23129856 is an abundant number, since it is smaller than the sum of its proper divisors (43565864).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23129856 is a wasteful number, since it uses less digits than its factorization.

23129856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10061 (or 10044 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 23129856 is about 4809.3508917524. The cubic root of 23129856 is about 284.9209014101.

The spelling of 23129856 in words is "twenty-three million, one hundred twenty-nine thousand, eight hundred fifty-six".