139408519 has 4 divisors (see below), whose sum is σ = 143905600. Its totient is φ = 134911440.

The previous prime is 139408513. The next prime is 139408523. The reversal of 139408519 is 915804931.

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 139408519 - 2¹¹ = 139406471 is a prime.

It is a super-2 number, since 2×139408519² = 38869470339546722, 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 (139408513) 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, 2248494 + ... + 2248555.

It is an arithmetic number, because the mean of its divisors is an integer number (35976400).

Almost surely, 2^139408519 is an apocalyptic number.

139408519 is a deficient number, since it is larger than the sum of its proper divisors (4497081).

139408519 is an equidigital number, since it uses as much as digits as its factorization.

139408519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4497080.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 139408519 is about 11807.1384763625. The cubic root of 139408519 is about 518.5171251838.

The spelling of 139408519 in words is "one hundred thirty-nine million, four hundred eight thousand, five hundred nineteen".