139439519 has 4 divisors (see below), whose sum is σ = 143937600. Its totient is φ = 134941440.

The previous prime is 139439513. The next prime is 139439539. The reversal of 139439519 is 915934931.

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 139439519 - 2¹² = 139435423 is a prime.

It is a super-2 number, since 2×139439519² = 38886758917902722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 139439519.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139439513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2248994 + ... + 2249055.

It is an arithmetic number, because the mean of its divisors is an integer number (35984400).

Almost surely, 2^139439519 is an apocalyptic number.

139439519 is a deficient number, since it is larger than the sum of its proper divisors (4498081).

139439519 is an equidigital number, since it uses as much as digits as its factorization.

139439519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4498080.

The product of its digits is 131220, while the sum is 44.

The square root of 139439519 is about 11808.4511685487. The cubic root of 139439519 is about 518.5555562153. Note that the first 5 decimals are identical.

The spelling of 139439519 in words is "one hundred thirty-nine million, four hundred thirty-nine thousand, five hundred nineteen".