23128247 has 4 divisors (see below), whose sum is σ = 23138856. Its totient is φ = 23117640.

The previous prime is 23128241. The next prime is 23128253. The reversal of 23128247 is 74282132.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (23128241) and next prime (23128253).

It is a cyclic number.

It is not a de Polignac number, because 23128247 - 2⁸ = 23127991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23128241) 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, 704 + ... + 6837.

It is an arithmetic number, because the mean of its divisors is an integer number (5784714).

Almost surely, 2^23128247 is an apocalyptic number.

23128247 is a deficient number, since it is larger than the sum of its proper divisors (10609).

23128247 is an equidigital number, since it uses as much as digits as its factorization.

23128247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10608.

The product of its digits is 5376, while the sum is 29.

The square root of 23128247 is about 4809.1836105518. The cubic root of 23128247 is about 284.9142945328.

The spelling of 23128247 in words is "twenty-three million, one hundred twenty-eight thousand, two hundred forty-seven".