22172739 has 4 divisors (see below), whose sum is σ = 29563656. Its totient is φ = 14781824.

The previous prime is 22172737. The next prime is 22172749. The reversal of 22172739 is 93727122.

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 22172739 - 2¹ = 22172737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22172737) 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, 3695454 + ... + 3695459.

It is an arithmetic number, because the mean of its divisors is an integer number (7390914).

Almost surely, 2^22172739 is an apocalyptic number.

22172739 is a deficient number, since it is larger than the sum of its proper divisors (7390917).

22172739 is an equidigital number, since it uses as much as digits as its factorization.

22172739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7390916.

The product of its digits is 10584, while the sum is 33.

The square root of 22172739 is about 4708.7937945933. The cubic root of 22172739 is about 280.9353878538.

The spelling of 22172739 in words is "twenty-two million, one hundred seventy-two thousand, seven hundred thirty-nine".