139718 has 4 divisors (see below), whose sum is σ = 209580. Its totient is φ = 69858.

The previous prime is 139709. The next prime is 139721. The reversal of 139718 is 817931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 817931 = 19 ⋅43049.

It is a super-2 number, since 2×139718² = 39042239048, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

139718 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 as a sum of consecutive naturals, namely, 34928 + ... + 34931.

It is an arithmetic number, because the mean of its divisors is an integer number (52395).

2¹³⁹⁷¹⁸ is an apocalyptic number.

139718 is a deficient number, since it is larger than the sum of its proper divisors (69862).

139718 is an equidigital number, since it uses as much as digits as its factorization.

139718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69861.

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

The square root of 139718 is about 373.7887103699. The cubic root of 139718 is about 51.8900536947.

The spelling of 139718 in words is "one hundred thirty-nine thousand, seven hundred eighteen".