23138856 has 96 divisors (see below), whose sum is σ = 68796000. Its totient is φ = 6982272.

The previous prime is 23138849. The next prime is 23138867. The reversal of 23138856 is 65883132.

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 23138856.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55015 + ... + 55433.

It is an arithmetic number, because the mean of its divisors is an integer number (716625).

Almost surely, 2^23138856 is an apocalyptic number.

23138856 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23138856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34398000).

23138856 is an abundant number, since it is smaller than the sum of its proper divisors (45657144).

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

23138856 is a wasteful number, since it uses less digits than its factorization.

23138856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503 (or 496 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 23138856 is about 4810.2864779553. The cubic root of 23138856 is about 284.9578515694.

The spelling of 23138856 in words is "twenty-three million, one hundred thirty-eight thousand, eight hundred fifty-six".