23927989 has 4 divisors (see below), whose sum is σ = 23941324. Its totient is φ = 23914656.

The previous prime is 23927983. The next prime is 23928017. The reversal of 23927989 is 98972932.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2924100 + 21003889 = 1710^2 + 4583^2 .

It is a cyclic number.

It is not a de Polignac number, because 23927989 - 2⁵ = 23927957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23927983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3462 + ... + 7735.

It is an arithmetic number, because the mean of its divisors is an integer number (5985331).

Almost surely, 2^23927989 is an apocalyptic number.

It is an amenable number.

23927989 is a deficient number, since it is larger than the sum of its proper divisors (13335).

23927989 is a wasteful number, since it uses less digits than its factorization.

23927989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13334.

The product of its digits is 489888, while the sum is 49.

The square root of 23927989 is about 4891.6243723328. The cubic root of 23927989 is about 288.1611310587.

The spelling of 23927989 in words is "twenty-three million, nine hundred twenty-seven thousand, nine hundred eighty-nine".