22978723 has 4 divisors (see below), whose sum is σ = 23467680. Its totient is φ = 22489768.

The previous prime is 22978691. The next prime is 22978777. The reversal of 22978723 is 32787922.

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 22978723 - 2⁵ = 22978691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22978783) 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, 244408 + ... + 244501.

It is an arithmetic number, because the mean of its divisors is an integer number (5866920).

Almost surely, 2^22978723 is an apocalyptic number.

22978723 is a deficient number, since it is larger than the sum of its proper divisors (488957).

22978723 is an equidigital number, since it uses as much as digits as its factorization.

22978723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488956.

The product of its digits is 84672, while the sum is 40.

The square root of 22978723 is about 4793.6127294557. The cubic root of 22978723 is about 284.2989767880.

The spelling of 22978723 in words is "twenty-two million, nine hundred seventy-eight thousand, seven hundred twenty-three".