23967999389 has 4 divisors (see below), whose sum is σ = 25377881724. Its totient is φ = 22558117056.

The previous prime is 23967999361. The next prime is 23967999397. The reversal of 23967999389 is 98399976932.

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 21044434489 + 2923564900 = 145067^2 + 54070^2 .

It is a cyclic number.

It is not a de Polignac number, because 23967999389 - 2²⁸ = 23699563933 is a prime.

It is a super-2 number, since 2×23967999389² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23967996389) 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, 704941142 + ... + 704941175.

It is an arithmetic number, because the mean of its divisors is an integer number (6344470431).

Almost surely, 2^23967999389 is an apocalyptic number.

It is an amenable number.

23967999389 is a deficient number, since it is larger than the sum of its proper divisors (1409882335).

23967999389 is a wasteful number, since it uses less digits than its factorization.

23967999389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1409882334.

The product of its digits is 357128352, while the sum is 74.

The spelling of 23967999389 in words is "twenty-three billion, nine hundred sixty-seven million, nine hundred ninety-nine thousand, three hundred eighty-nine".