23181988 has 24 divisors (see below), whose sum is σ = 42311808. Its totient is φ = 11103456.

The previous prime is 23181979. The next prime is 23181989. The reversal of 23181988 is 88918132.

It is a self number, because there is not a number n which added to its sum of digits gives 23181988.

It is not an unprimeable number, because it can be changed into a prime (23181989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7845 + ... + 10387.

It is an arithmetic number, because the mean of its divisors is an integer number (1762992).

Almost surely, 2^23181988 is an apocalyptic number.

It is an amenable number.

23181988 is a deficient number, since it is larger than the sum of its proper divisors (19129820).

23181988 is a wasteful number, since it uses less digits than its factorization.

23181988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2643 (or 2641 counting only the distinct ones).

The product of its digits is 27648, while the sum is 40.

The square root of 23181988 is about 4814.7676994846. The cubic root of 23181988 is about 285.1348002924.

The spelling of 23181988 in words is "twenty-three million, one hundred eighty-one thousand, nine hundred eighty-eight".