22239947 has 2 divisors, whose sum is σ = 22239948. Its totient is φ = 22239946.

The previous prime is 22239911. The next prime is 22239949. The reversal of 22239947 is 74993222.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22239947 is a prime.

Together with 22239949, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22239947.

It is not a weakly prime, because it can be changed into another prime (22239949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11119973 + 11119974.

It is an arithmetic number, because the mean of its divisors is an integer number (11119974).

Almost surely, 2^22239947 is an apocalyptic number.

22239947 is a deficient number, since it is larger than the sum of its proper divisors (1).

22239947 is an equidigital number, since it uses as much as digits as its factorization.

22239947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 38.

The square root of 22239947 is about 4715.9248297656. The cubic root of 22239947 is about 281.2189501854.

The spelling of 22239947 in words is "twenty-two million, two hundred thirty-nine thousand, nine hundred forty-seven".