22157729 has 8 divisors (see below), whose sum is σ = 24206688. Its totient is φ = 20114560.

The previous prime is 22157713. The next prime is 22157741. The reversal of 22157729 is 92775122.

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 22157729 - 2⁴ = 22157713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22157789) 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, 12209 + ... + 13905.

It is an arithmetic number, because the mean of its divisors is an integer number (3025836).

Almost surely, 2^22157729 is an apocalyptic number.

It is an amenable number.

22157729 is a deficient number, since it is larger than the sum of its proper divisors (2048959).

22157729 is a wasteful number, since it uses less digits than its factorization.

22157729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2895.

The product of its digits is 17640, while the sum is 35.

The square root of 22157729 is about 4707.1996983345. The cubic root of 22157729 is about 280.8719797791.

It can be divided in two parts, 22 and 157729, that added together give a palindrome (157751).

The spelling of 22157729 in words is "twenty-two million, one hundred fifty-seven thousand, seven hundred twenty-nine".