22139993 has 2 divisors, whose sum is σ = 22139994. Its totient is φ = 22139992.

The previous prime is 22139981. The next prime is 22140029. The reversal of 22139993 is 39993122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20912329 + 1227664 = 4573^2 + 1108^2 .

It is a cyclic number.

It is not a de Polignac number, because 22139993 - 2⁸ = 22139737 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (22109993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11069996 + 11069997.

It is an arithmetic number, because the mean of its divisors is an integer number (11069997).

Almost surely, 2^22139993 is an apocalyptic number.

It is an amenable number.

22139993 is a deficient number, since it is larger than the sum of its proper divisors (1).

22139993 is an equidigital number, since it uses as much as digits as its factorization.

22139993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26244, while the sum is 38.

The square root of 22139993 is about 4705.3153985679. The cubic root of 22139993 is about 280.7970191010.

It can be divided in two parts, 22139 and 993, that added together give a palindrome (23132).

The spelling of 22139993 in words is "twenty-two million, one hundred thirty-nine thousand, nine hundred ninety-three".