139917 has 4 divisors (see below), whose sum is σ = 186560. Its totient is φ = 93276.

The previous prime is 139907. The next prime is 139921. The reversal of 139917 is 719931.

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, and also an emirpimes, since its reverse is a distinct semiprime: 719931 = 3 ⋅239977.

It is not a de Polignac number, because 139917 - 2⁴ = 139901 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139917.

It is not an unprimeable number, because it can be changed into a prime (139907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23317 + ... + 23322.

It is an arithmetic number, because the mean of its divisors is an integer number (46640).

2¹³⁹⁹¹⁷ is an apocalyptic number.

It is an amenable number.

139917 is a deficient number, since it is larger than the sum of its proper divisors (46643).

139917 is an equidigital number, since it uses as much as digits as its factorization.

139917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46642.

The product of its digits is 1701, while the sum is 30.

The square root of 139917 is about 374.0548088182. The cubic root of 139917 is about 51.9146776326.

The spelling of 139917 in words is "one hundred thirty-nine thousand, nine hundred seventeen".