23987789 has 4 divisors (see below), whose sum is σ = 27414624. Its totient is φ = 20560956.

The previous prime is 23987779. The next prime is 23987791. The reversal of 23987789 is 98778932.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23987789 - 2⁸ = 23987533 is a prime.

It is a super-2 number, since 2×23987789² = 1150828042217042, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23987789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23987759) 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, 1713407 + ... + 1713420.

It is an arithmetic number, because the mean of its divisors is an integer number (6853656).

Almost surely, 2^23987789 is an apocalyptic number.

It is an amenable number.

23987789 is a deficient number, since it is larger than the sum of its proper divisors (3426835).

23987789 is an equidigital number, since it uses as much as digits as its factorization.

23987789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3426834.

The product of its digits is 1524096, while the sum is 53.

The square root of 23987789 is about 4897.7330470331. The cubic root of 23987789 is about 288.4009854582.

The spelling of 23987789 in words is "twenty-three million, nine hundred eighty-seven thousand, seven hundred eighty-nine".