23821136 has 40 divisors (see below), whose sum is σ = 49044480. Its totient is φ = 11176704.

The previous prime is 23821129. The next prime is 23821157. The reversal of 23821136 is 63112832.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38300 + ... + 38916.

It is an arithmetic number, because the mean of its divisors is an integer number (1226112).

Almost surely, 2^23821136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23821136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24522240).

23821136 is an abundant number, since it is smaller than the sum of its proper divisors (25223344).

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

23821136 is a wasteful number, since it uses less digits than its factorization.

23821136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771 (or 765 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 23821136 is about 4880.6901151374. The cubic root of 23821136 is about 287.7315528395.

Adding to 23821136 its reverse (63112832), we get a palindrome (86933968).

The spelling of 23821136 in words is "twenty-three million, eight hundred twenty-one thousand, one hundred thirty-six".