22138939 has 2 divisors, whose sum is σ = 22138940. Its totient is φ = 22138938.

The previous prime is 22138931. The next prime is 22138943. The reversal of 22138939 is 93983122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22138939 - 2³ = 22138931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22138898 and 22138907.

It is not a weakly prime, because it can be changed into another prime (22138931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11069469 + 11069470.

It is an arithmetic number, because the mean of its divisors is an integer number (11069470).

Almost surely, 2^22138939 is an apocalyptic number.

22138939 is a deficient number, since it is larger than the sum of its proper divisors (1).

22138939 is an equidigital number, since it uses as much as digits as its factorization.

22138939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 37.

The square root of 22138939 is about 4705.2033962412. The cubic root of 22138939 is about 280.7925631413.

The spelling of 22138939 in words is "twenty-two million, one hundred thirty-eight thousand, nine hundred thirty-nine".