139817917 has 8 divisors (see below), whose sum is σ = 142303392. Its totient is φ = 137338800.

The previous prime is 139817893. The next prime is 139817927. The reversal of 139817917 is 719718931.

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 139817917 - 2¹¹ = 139815869 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 (139817927) 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, 71442 + ... + 73372.

It is an arithmetic number, because the mean of its divisors is an integer number (17787924).

Almost surely, 2^139817917 is an apocalyptic number.

It is an amenable number.

139817917 is a deficient number, since it is larger than the sum of its proper divisors (2485475).

139817917 is a wasteful number, since it uses less digits than its factorization.

139817917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3179.

The product of its digits is 95256, while the sum is 46.

The square root of 139817917 is about 11824.4626516388. The cubic root of 139817917 is about 519.0242018308.

The spelling of 139817917 in words is "one hundred thirty-nine million, eight hundred seventeen thousand, nine hundred seventeen".