23919391 has 4 divisors (see below), whose sum is σ = 25326432. Its totient is φ = 22512352.

The previous prime is 23919361. The next prime is 23919397. The reversal of 23919391 is 19391932.

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

It is not a de Polignac number, because 23919391 - 2⁷ = 23919263 is a prime.

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 23919391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23919397) 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 3 ways as a sum of consecutive naturals, for example, 703495 + ... + 703528.

It is an arithmetic number, because the mean of its divisors is an integer number (6331608).

Almost surely, 2^23919391 is an apocalyptic number.

23919391 is a deficient number, since it is larger than the sum of its proper divisors (1407041).

23919391 is a wasteful number, since it uses less digits than its factorization.

23919391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407040.

The product of its digits is 13122, while the sum is 37.

The square root of 23919391 is about 4890.7454442038. The cubic root of 23919391 is about 288.1266121219.

It can be divided in two parts, 23919 and 391, that added together give a triangular number (24310 = T₂₂₀).

The spelling of 23919391 in words is "twenty-three million, nine hundred nineteen thousand, three hundred ninety-one".