139739671 has 4 divisors (see below), whose sum is σ = 142108200. Its totient is φ = 137371144.

The previous prime is 139739659. The next prime is 139739683. The reversal of 139739671 is 176937931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 176937931 = 10453 ⋅16927.

It is an interprime number because it is at equal distance from previous prime (139739659) and next prime (139739683).

It is a cyclic number.

It is not a de Polignac number, because 139739671 - 2¹⁹ = 139215383 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 (139739771) 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, 1184176 + ... + 1184293.

It is an arithmetic number, because the mean of its divisors is an integer number (35527050).

Almost surely, 2^139739671 is an apocalyptic number.

139739671 is a deficient number, since it is larger than the sum of its proper divisors (2368529).

139739671 is an equidigital number, since it uses as much as digits as its factorization.

139739671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2368528.

The product of its digits is 214326, while the sum is 46.

The square root of 139739671 is about 11821.1535393125. The cubic root of 139739671 is about 518.9273636317.

The spelling of 139739671 in words is "one hundred thirty-nine million, seven hundred thirty-nine thousand, six hundred seventy-one".