138849049 has 4 divisors (see below), whose sum is σ = 142601764. Its totient is φ = 135096336.

The previous prime is 138849041. The next prime is 138849059. The reversal of 138849049 is 940948831.

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 132089049 + 6760000 = 11493^2 + 2600^2 .

It is a cyclic number.

It is not a de Polignac number, because 138849049 - 2³ = 138849041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138849041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1876302 + ... + 1876375.

It is an arithmetic number, because the mean of its divisors is an integer number (35650441).

Almost surely, 2^138849049 is an apocalyptic number.

It is an amenable number.

138849049 is a deficient number, since it is larger than the sum of its proper divisors (3752715).

138849049 is an equidigital number, since it uses as much as digits as its factorization.

138849049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3752714.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 138849049 is about 11783.4226352109. The cubic root of 138849049 is about 517.8225628712.

The spelling of 138849049 in words is "one hundred thirty-eight million, eight hundred forty-nine thousand, forty-nine".