23138723 has 4 divisors (see below), whose sum is σ = 23936640. Its totient is φ = 22340808.

The previous prime is 23138707. The next prime is 23138729. The reversal of 23138723 is 32783132.

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

It is a cyclic number.

It is not a de Polignac number, because 23138723 - 2⁴ = 23138707 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 797887 = 23138723 / (2 + 3 + 1 + 3 + 8 + 7 + 2 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23138729) 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, 398915 + ... + 398972.

It is an arithmetic number, because the mean of its divisors is an integer number (5984160).

Almost surely, 2^23138723 is an apocalyptic number.

23138723 is a deficient number, since it is larger than the sum of its proper divisors (797917).

23138723 is an equidigital number, since it uses as much as digits as its factorization.

23138723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797916.

The product of its digits is 6048, while the sum is 29.

The square root of 23138723 is about 4810.2726533950. The cubic root of 23138723 is about 284.9573055979.

The spelling of 23138723 in words is "twenty-three million, one hundred thirty-eight thousand, seven hundred twenty-three".