138342819 has 8 divisors (see below), whose sum is σ = 194165440. Its totient is φ = 87374376.

The previous prime is 138342817. The next prime is 138342829. The reversal of 138342819 is 918243831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138342819 - 2¹ = 138342817 is a prime.

It is a super-2 number, since 2×138342819² = 38277471137733522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138342817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1213477 + ... + 1213590.

It is an arithmetic number, because the mean of its divisors is an integer number (24270680).

Almost surely, 2^138342819 is an apocalyptic number.

138342819 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

138342819 is a deficient number, since it is larger than the sum of its proper divisors (55822621).

138342819 is a wasteful number, since it uses less digits than its factorization.

138342819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2427089.

The product of its digits is 41472, while the sum is 39.

The square root of 138342819 is about 11761.9224194007. The cubic root of 138342819 is about 517.1924864432.

It can be divided in two parts, 13834 and 2819, that added together give a triangular number (16653 = T₁₈₂).

The spelling of 138342819 in words is "one hundred thirty-eight million, three hundred forty-two thousand, eight hundred nineteen".