22918729 has 8 divisors (see below), whose sum is σ = 24045120. Its totient is φ = 21814800.

The previous prime is 22918717. The next prime is 22918739. The reversal of 22918729 is 92781922.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22918729 - 2¹¹ = 22916681 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22918691 and 22918700.

It is not an unprimeable number, because it can be changed into a prime (22918739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3507 + ... + 7624.

It is an arithmetic number, because the mean of its divisors is an integer number (3005640).

Almost surely, 2^22918729 is an apocalyptic number.

22918729 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

22918729 is a deficient number, since it is larger than the sum of its proper divisors (1126391).

22918729 is a wasteful number, since it uses less digits than its factorization.

22918729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11231.

The product of its digits is 36288, while the sum is 40.

The square root of 22918729 is about 4787.3509376272. The cubic root of 22918729 is about 284.0513404836.

The spelling of 22918729 in words is "twenty-two million, nine hundred eighteen thousand, seven hundred twenty-nine".