138945259 has 4 divisors (see below), whose sum is σ = 138971560. Its totient is φ = 138918960.

The previous prime is 138945253. The next prime is 138945283. The reversal of 138945259 is 952549831.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138945259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138945253) 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, 2169 + ... + 16810.

It is an arithmetic number, because the mean of its divisors is an integer number (34742890).

Almost surely, 2^138945259 is an apocalyptic number.

138945259 is a deficient number, since it is larger than the sum of its proper divisors (26301).

138945259 is an equidigital number, since it uses as much as digits as its factorization.

138945259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26300.

The product of its digits is 388800, while the sum is 46.

The square root of 138945259 is about 11787.5043584297. The cubic root of 138945259 is about 517.9421368659.

The spelling of 138945259 in words is "one hundred thirty-eight million, nine hundred forty-five thousand, two hundred fifty-nine".