139817 has 4 divisors (see below), whose sum is σ = 145920. Its totient is φ = 133716.

The previous prime is 139813. The next prime is 139831. The reversal of 139817 is 718931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 139817 - 2² = 139813 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 139817.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139817.

It is not an unprimeable number, because it can be changed into a prime (139813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3017 + ... + 3062.

It is an arithmetic number, because the mean of its divisors is an integer number (36480).

2¹³⁹⁸¹⁷ is an apocalyptic number.

It is an amenable number.

139817 is a deficient number, since it is larger than the sum of its proper divisors (6103).

139817 is an equidigital number, since it uses as much as digits as its factorization.

139817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6102.

The product of its digits is 1512, while the sum is 29.

The square root of 139817 is about 373.9211146753. The cubic root of 139817 is about 51.9023067150.

The spelling of 139817 in words is "one hundred thirty-nine thousand, eight hundred seventeen".