138193907 has 8 divisors (see below), whose sum is σ = 140083200. Its totient is φ = 136317384.

The previous prime is 138193883. The next prime is 138193919. The reversal of 138193907 is 709391831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138193907 - 2⁸ = 138193651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138193987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19694 + ... + 25772.

It is an arithmetic number, because the mean of its divisors is an integer number (17510400).

Almost surely, 2^138193907 is an apocalyptic number.

138193907 is a deficient number, since it is larger than the sum of its proper divisors (1889293).

138193907 is a wasteful number, since it uses less digits than its factorization.

138193907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6385.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 138193907 is about 11755.5904573101. The cubic root of 138193907 is about 517.0068514195.

The spelling of 138193907 in words is "one hundred thirty-eight million, one hundred ninety-three thousand, nine hundred seven".