23742989 has 4 divisors (see below), whose sum is σ = 24992640. Its totient is φ = 22493340.

The previous prime is 23742881. The next prime is 23742997. The reversal of 23742989 is 98924732.

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 de Polignac number, because none of the positive numbers 2^k-23742989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23742289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 624797 + ... + 624834.

It is an arithmetic number, because the mean of its divisors is an integer number (6248160).

Almost surely, 2^23742989 is an apocalyptic number.

It is an amenable number.

23742989 is a deficient number, since it is larger than the sum of its proper divisors (1249651).

23742989 is a wasteful number, since it uses less digits than its factorization.

23742989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249650.

The product of its digits is 217728, while the sum is 44.

The square root of 23742989 is about 4872.6778058887. The cubic root of 23742989 is about 287.4165665900.

The spelling of 23742989 in words is "twenty-three million, seven hundred forty-two thousand, nine hundred eighty-nine".