23991930 has 64 divisors (see below), whose sum is σ = 67754880. Its totient is φ = 6020352.

The previous prime is 23991917. The next prime is 23991931. The reversal of 23991930 is 3919932.

It is a super-2 number, since 2×23991930² = 1151225410249800, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (23991931) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1977 + ... + 7203.

It is an arithmetic number, because the mean of its divisors is an integer number (1058670).

Almost surely, 2^23991930 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23991930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33877440).

23991930 is an abundant number, since it is smaller than the sum of its proper divisors (43762950).

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

23991930 is a wasteful number, since it uses less digits than its factorization.

23991930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5260 (or 5254 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 36.

The square root of 23991930 is about 4898.1557753914. The cubic root of 23991930 is about 288.4175800092.

The spelling of 23991930 in words is "twenty-three million, nine hundred ninety-one thousand, nine hundred thirty".