138055949 has 4 divisors (see below), whose sum is σ = 138109980. Its totient is φ = 138001920.

The previous prime is 138055877. The next prime is 138055987. The reversal of 138055949 is 949550831.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 51696100 + 86359849 = 7190^2 + 9293^2 .

It is a cyclic number.

It is not a de Polignac number, because 138055949 - 2²⁰ = 137007373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138055549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22982 + ... + 28359.

It is an arithmetic number, because the mean of its divisors is an integer number (34527495).

Almost surely, 2^138055949 is an apocalyptic number.

It is an amenable number.

138055949 is a deficient number, since it is larger than the sum of its proper divisors (54031).

138055949 is an equidigital number, since it uses as much as digits as its factorization.

138055949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54030.

The product of its (nonzero) digits is 194400, while the sum is 44.

The square root of 138055949 is about 11749.7212307356. The cubic root of 138055949 is about 516.8347527107.

The spelling of 138055949 in words is "one hundred thirty-eight million, fifty-five thousand, nine hundred forty-nine".