23991772 has 36 divisors (see below), whose sum is σ = 49332360. Its totient is φ = 10178784.

The previous prime is 23991769. The next prime is 23991797. The reversal of 23991772 is 27719932.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20803 + ... + 21925.

Almost surely, 2^23991772 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 23991772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24666180).

23991772 is an abundant number, since it is smaller than the sum of its proper divisors (25340588).

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

23991772 is a wasteful number, since it uses less digits than its factorization.

23991772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1250 (or 1241 counting only the distinct ones).

The product of its digits is 47628, while the sum is 40.

The square root of 23991772 is about 4898.1396468455. The cubic root of 23991772 is about 288.4169468786.

The spelling of 23991772 in words is "twenty-three million, nine hundred ninety-one thousand, seven hundred seventy-two".