138044907 has 108 divisors (see below), whose sum is σ = 275948400. Its totient is φ = 65862720.

The previous prime is 138044897. The next prime is 138044923. The reversal of 138044907 is 709440831.

It is a happy number.

It is not a de Polignac number, because 138044907 - 2⁷ = 138044779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138044957) by changing a digit.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 693594 + ... + 693792.

Almost surely, 2^138044907 is an apocalyptic number.

138044907 is a deficient number, since it is larger than the sum of its proper divisors (137903493).

138044907 is a wasteful number, since it uses less digits than its factorization.

138044907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254 (or 233 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 138044907 is about 11749.2513378513. The cubic root of 138044907 is about 516.8209731729.

The spelling of 138044907 in words is "one hundred thirty-eight million, forty-four thousand, nine hundred seven".