22139749 has 2 divisors, whose sum is σ = 22139750. Its totient is φ = 22139748.

The previous prime is 22139737. The next prime is 22139837. The reversal of 22139749 is 94793122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20160100 + 1979649 = 4490^2 + 1407^2 .

It is a cyclic number.

It is not a de Polignac number, because 22139749 - 2²¹ = 20042597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22139449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11069874 + 11069875.

It is an arithmetic number, because the mean of its divisors is an integer number (11069875).

Almost surely, 2^22139749 is an apocalyptic number.

It is an amenable number.

22139749 is a deficient number, since it is larger than the sum of its proper divisors (1).

22139749 is an equidigital number, since it uses as much as digits as its factorization.

22139749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 37.

The square root of 22139749 is about 4705.2894703727. The cubic root of 22139749 is about 280.7959875632.

The spelling of 22139749 in words is "twenty-two million, one hundred thirty-nine thousand, seven hundred forty-nine".