23228749 has 4 divisors (see below), whose sum is σ = 24595164. Its totient is φ = 21862336.

The previous prime is 23228743. The next prime is 23228753. The reversal of 23228749 is 94782232.

23228749 = 810² + 811² + ... + 843².

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

It can be written as a sum of positive squares in 2 ways, for example, as 18576100 + 4652649 = 4310^2 + 2157^2 .

It is a cyclic number.

It is not a de Polignac number, because 23228749 - 2³ = 23228741 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 (23228741) 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, 683182 + ... + 683215.

It is an arithmetic number, because the mean of its divisors is an integer number (6148791).

Almost surely, 2^23228749 is an apocalyptic number.

It is an amenable number.

23228749 is a deficient number, since it is larger than the sum of its proper divisors (1366415).

23228749 is a wasteful number, since it uses less digits than its factorization.

23228749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366414.

The product of its digits is 48384, while the sum is 37.

The square root of 23228749 is about 4819.6212506794. The cubic root of 23228749 is about 285.3263891748.

The spelling of 23228749 in words is "twenty-three million, two hundred twenty-eight thousand, seven hundred forty-nine".