23457891 has 4 divisors (see below), whose sum is σ = 31277192. Its totient is φ = 15638592.

The previous prime is 23457887. The next prime is 23457911. The reversal of 23457891 is 19875432.

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

It is not a de Polignac number, because 23457891 - 2² = 23457887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23457871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3909646 + ... + 3909651.

It is an arithmetic number, because the mean of its divisors is an integer number (7819298).

Almost surely, 2^23457891 is an apocalyptic number.

23457891 is a deficient number, since it is larger than the sum of its proper divisors (7819301).

23457891 is an equidigital number, since it uses as much as digits as its factorization.

23457891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7819300.

The product of its digits is 60480, while the sum is 39.

The square root of 23457891 is about 4843.3346983251. The cubic root of 23457891 is about 286.2615298903.

The spelling of 23457891 in words is "twenty-three million, four hundred fifty-seven thousand, eight hundred ninety-one".