22491252 has 72 divisors (see below), whose sum is σ = 65520000. Its totient is φ = 6372288.

The previous prime is 22491191. The next prime is 22491253. The reversal of 22491252 is 25219422.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22491253) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37249 + ... + 37847.

It is an arithmetic number, because the mean of its divisors is an integer number (910000).

Almost surely, 2^22491252 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 22491252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32760000).

22491252 is an abundant number, since it is smaller than the sum of its proper divisors (43028748).

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

22491252 is a wasteful number, since it uses less digits than its factorization.

22491252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765 (or 760 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 22491252 is about 4742.4942804394. The cubic root of 22491252 is about 282.2742164407.

The spelling of 22491252 in words is "twenty-two million, four hundred ninety-one thousand, two hundred fifty-two".