22439999 has 2 divisors, whose sum is σ = 22440000. Its totient is φ = 22439998.

The previous prime is 22439993. The next prime is 22440031. The reversal of 22439999 is 99993422.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22439999 is a prime.

It is a Sophie Germain prime.

22439999 is a modest number, since divided by 9999 gives 2243 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22439993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11219999 + 11220000.

It is an arithmetic number, because the mean of its divisors is an integer number (11220000).

Almost surely, 2^22439999 is an apocalyptic number.

22439999 is a deficient number, since it is larger than the sum of its proper divisors (1).

22439999 is an equidigital number, since it uses as much as digits as its factorization.

22439999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 314928, while the sum is 47.

The square root of 22439999 is about 4737.0876073807. The cubic root of 22439999 is about 282.0596381420.

The spelling of 22439999 in words is "twenty-two million, four hundred thirty-nine thousand, nine hundred ninety-nine".