22818729 has 4 divisors (see below), whose sum is σ = 30424976. Its totient is φ = 15212484.

The previous prime is 22818727. The next prime is 22818749. The reversal of 22818729 is 92781822.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 22818729 - 2¹ = 22818727 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22818727) 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, 3803119 + ... + 3803124.

It is an arithmetic number, because the mean of its divisors is an integer number (7606244).

Almost surely, 2^22818729 is an apocalyptic number.

It is an amenable number.

22818729 is a deficient number, since it is larger than the sum of its proper divisors (7606247).

22818729 is an equidigital number, since it uses as much as digits as its factorization.

22818729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7606246.

The product of its digits is 32256, while the sum is 39.

The square root of 22818729 is about 4776.8953306515. The cubic root of 22818729 is about 283.6376097552.

The spelling of 22818729 in words is "twenty-two million, eight hundred eighteen thousand, seven hundred twenty-nine".