139518919 has 8 divisors (see below), whose sum is σ = 147276080. Its totient is φ = 132169320.

The previous prime is 139518839. The next prime is 139518923. The reversal of 139518919 is 919815931.

It is not a de Polignac number, because 139518919 - 2¹³ = 139510727 is a prime.

It is a super-2 number, since 2×139518919² = 38931057517857122, 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 (139518019) 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 7 ways as a sum of consecutive naturals, for example, 3312 + ... + 17029.

It is an arithmetic number, because the mean of its divisors is an integer number (18409510).

Almost surely, 2^139518919 is an apocalyptic number.

139518919 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

139518919 is a deficient number, since it is larger than the sum of its proper divisors (7757161).

139518919 is an frugal number, since it uses more digits than its factorization.

139518919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20398 (or 20360 counting only the distinct ones).

The product of its digits is 87480, while the sum is 46.

The square root of 139518919 is about 11811.8126889991. The cubic root of 139518919 is about 518.6539632736.

The spelling of 139518919 in words is "one hundred thirty-nine million, five hundred eighteen thousand, nine hundred nineteen".