138635719 has 4 divisors (see below), whose sum is σ = 142017120. Its totient is φ = 135254320.

The previous prime is 138635677. The next prime is 138635729. The reversal of 138635719 is 917536831.

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

It is a cyclic number.

It is not a de Polignac number, because 138635719 - 2¹⁵ = 138602951 is a prime.

It is a super-2 number, since 2×138635719² = 38439725165293922, 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 (138635729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1690639 + ... + 1690720.

It is an arithmetic number, because the mean of its divisors is an integer number (35504280).

Almost surely, 2^138635719 is an apocalyptic number.

138635719 is a deficient number, since it is larger than the sum of its proper divisors (3381401).

138635719 is an equidigital number, since it uses as much as digits as its factorization.

138635719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3381400.

The product of its digits is 136080, while the sum is 43.

The square root of 138635719 is about 11774.3670318196. The cubic root of 138635719 is about 517.5572298568.

The spelling of 138635719 in words is "one hundred thirty-eight million, six hundred thirty-five thousand, seven hundred nineteen".