139971719 has 4 divisors (see below), whose sum is σ = 144798360. Its totient is φ = 135145080.

The previous prime is 139971707. The next prime is 139971731. The reversal of 139971719 is 917179931.

139971719 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (139971707) and next prime (139971731).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139971719 is a prime.

It is a super-2 number, since 2×139971719² = 39184164239629922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139971739) 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, 2413277 + ... + 2413334.

It is an arithmetic number, because the mean of its divisors is an integer number (36199590).

Almost surely, 2^139971719 is an apocalyptic number.

139971719 is a deficient number, since it is larger than the sum of its proper divisors (4826641).

139971719 is an equidigital number, since it uses as much as digits as its factorization.

139971719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4826640.

The product of its digits is 107163, while the sum is 47.

The square root of 139971719 is about 11830.9644154650. The cubic root of 139971719 is about 519.2144438006.

The spelling of 139971719 in words is "one hundred thirty-nine million, nine hundred seventy-one thousand, seven hundred nineteen".