138868407 has 12 divisors (see below), whose sum is σ = 200922904. Its totient is φ = 92424240.

The previous prime is 138868399. The next prime is 138868423. The reversal of 138868407 is 704868831.

It is not a de Polignac number, because 138868407 - 2³ = 138868399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138868487) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7069 + ... + 18102.

Almost surely, 2^138868407 is an apocalyptic number.

138868407 is a deficient number, since it is larger than the sum of its proper divisors (62054497).

138868407 is a wasteful number, since it uses less digits than its factorization.

138868407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25790 (or 25787 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The square root of 138868407 is about 11784.2440147852. The cubic root of 138868407 is about 517.8466262778.

The spelling of 138868407 in words is "one hundred thirty-eight million, eight hundred sixty-eight thousand, four hundred seven".