22538729 has 4 divisors (see below), whose sum is σ = 22619220. Its totient is φ = 22458240.

The previous prime is 22538723. The next prime is 22538741. The reversal of 22538729 is 92783522.

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 7507600 + 15031129 = 2740^2 + 3877^2 .

It is a cyclic number.

It is not a de Polignac number, because 22538729 - 2⁸ = 22538473 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22538692 and 22538701.

It is not an unprimeable number, because it can be changed into a prime (22538723) 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, 39824 + ... + 40385.

It is an arithmetic number, because the mean of its divisors is an integer number (5654805).

Almost surely, 2^22538729 is an apocalyptic number.

It is an amenable number.

22538729 is a deficient number, since it is larger than the sum of its proper divisors (80491).

22538729 is an equidigital number, since it uses as much as digits as its factorization.

22538729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80490.

The product of its digits is 60480, while the sum is 38.

The square root of 22538729 is about 4747.4971300676. The cubic root of 22538729 is about 282.4726953013.

The spelling of 22538729 in words is "twenty-two million, five hundred thirty-eight thousand, seven hundred twenty-nine".