138622949 has 2 divisors, whose sum is σ = 138622950. Its totient is φ = 138622948.

The previous prime is 138622921. The next prime is 138623011. The reversal of 138622949 is 949226831.

138622949 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118417924 + 20205025 = 10882^2 + 4495^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138622949 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138622849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69311474 + 69311475.

It is an arithmetic number, because the mean of its divisors is an integer number (69311475).

Almost surely, 2^138622949 is an apocalyptic number.

It is an amenable number.

138622949 is a deficient number, since it is larger than the sum of its proper divisors (1).

138622949 is an equidigital number, since it uses as much as digits as its factorization.

138622949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 44.

The square root of 138622949 is about 11773.8247396502. The cubic root of 138622949 is about 517.5413383082.

The spelling of 138622949 in words is "one hundred thirty-eight million, six hundred twenty-two thousand, nine hundred forty-nine".