138944107 has 4 divisors (see below), whose sum is σ = 139711936. Its totient is φ = 138176280.

The previous prime is 138944087. The next prime is 138944119. The reversal of 138944107 is 701449831.

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-138944107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138944177) 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, 383643 + ... + 384004.

It is an arithmetic number, because the mean of its divisors is an integer number (34927984).

Almost surely, 2^138944107 is an apocalyptic number.

138944107 is a deficient number, since it is larger than the sum of its proper divisors (767829).

138944107 is an equidigital number, since it uses as much as digits as its factorization.

138944107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767828.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 138944107 is about 11787.4554930231. The cubic root of 138944107 is about 517.9407054364.

The spelling of 138944107 in words is "one hundred thirty-eight million, nine hundred forty-four thousand, one hundred seven".