23809919 has 4 divisors (see below), whose sum is σ = 27211344. Its totient is φ = 20408496.

The previous prime is 23809909. The next prime is 23809927. The reversal of 23809919 is 91990832.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23809919 is a prime.

It is a super-2 number, since 2×23809919² = 1133824485573122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23809909) 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, 1700702 + ... + 1700715.

It is an arithmetic number, because the mean of its divisors is an integer number (6802836).

Almost surely, 2^23809919 is an apocalyptic number.

23809919 is a deficient number, since it is larger than the sum of its proper divisors (3401425).

23809919 is an equidigital number, since it uses as much as digits as its factorization.

23809919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3401424.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 23809919 is about 4879.5408595482. The cubic root of 23809919 is about 287.6863829876.

The spelling of 23809919 in words is "twenty-three million, eight hundred nine thousand, nine hundred nineteen".