138894717 has 32 divisors (see below), whose sum is σ = 207607680. Its totient is φ = 82010880.

The previous prime is 138894713. The next prime is 138894727. The reversal of 138894717 is 717498831.

It is not a de Polignac number, because 138894717 - 2² = 138894713 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138894713) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 256467 + ... + 257007.

It is an arithmetic number, because the mean of its divisors is an integer number (6487740).

Almost surely, 2^138894717 is an apocalyptic number.

It is an amenable number.

138894717 is a deficient number, since it is larger than the sum of its proper divisors (68712963).

138894717 is a wasteful number, since it uses less digits than its factorization.

138894717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813.

The product of its digits is 338688, while the sum is 48.

The square root of 138894717 is about 11785.3602829952. The cubic root of 138894717 is about 517.8793279428.

The spelling of 138894717 in words is "one hundred thirty-eight million, eight hundred ninety-four thousand, seven hundred seventeen".