139505717 has 8 divisors (see below), whose sum is σ = 153731424. Its totient is φ = 125779248.

The previous prime is 139505711. The next prime is 139505749. The reversal of 139505717 is 717505931.

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 139505717 - 2¹⁰ = 139504693 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 (139505711) 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, 124223 + ... + 125340.

It is an arithmetic number, because the mean of its divisors is an integer number (19216428).

Almost surely, 2^139505717 is an apocalyptic number.

It is an amenable number.

139505717 is a deficient number, since it is larger than the sum of its proper divisors (14225707).

139505717 is a wasteful number, since it uses less digits than its factorization.

139505717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249619.

The product of its (nonzero) digits is 33075, while the sum is 38.

The square root of 139505717 is about 11811.2538284468. The cubic root of 139505717 is about 518.6376035196.

The spelling of 139505717 in words is "one hundred thirty-nine million, five hundred five thousand, seven hundred seventeen".