23851989 has 80 divisors (see below), whose sum is σ = 44605440. Its totient is φ = 12402720.

The previous prime is 23851987. The next prime is 23851991. The reversal of 23851989 is 98915832.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (23851987) and next prime (23851991).

It is not a de Polignac number, because 23851989 - 2¹ = 23851987 is a prime.

It is a super-2 number, since 2×23851989² = 1137834758512242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23851981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 404242 + ... + 404300.

It is an arithmetic number, because the mean of its divisors is an integer number (557568).

Almost surely, 2^23851989 is an apocalyptic number.

It is an amenable number.

23851989 is a deficient number, since it is larger than the sum of its proper divisors (20753451).

23851989 is a wasteful number, since it uses less digits than its factorization.

23851989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132 (or 123 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 23851989 is about 4883.8498134156. The cubic root of 23851989 is about 287.8557220046.

The spelling of 23851989 in words is "twenty-three million, eight hundred fifty-one thousand, nine hundred eighty-nine".