22142779 has 4 divisors (see below), whose sum is σ = 22174720. Its totient is φ = 22110840.

The previous prime is 22142749. The next prime is 22142797. The reversal of 22142779 is 97724122.

It is a happy number.

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 22142779 - 2⁷ = 22142651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22142719) 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, 14907 + ... + 16324.

It is an arithmetic number, because the mean of its divisors is an integer number (5543680).

Almost surely, 2^22142779 is an apocalyptic number.

22142779 is a deficient number, since it is larger than the sum of its proper divisors (31941).

22142779 is an equidigital number, since it uses as much as digits as its factorization.

22142779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31940.

The product of its digits is 14112, while the sum is 34.

The square root of 22142779 is about 4705.6114374223. The cubic root of 22142779 is about 280.8087966971.

The spelling of 22142779 in words is "twenty-two million, one hundred forty-two thousand, seven hundred seventy-nine".