139347539 has 4 divisors (see below), whose sum is σ = 146681640. Its totient is φ = 132013440.

The previous prime is 139347529. The next prime is 139347553. The reversal of 139347539 is 935743931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 935743931 = 25339 ⋅36929.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139347539 is a prime.

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 139347539.

It is not an unprimeable number, because it can be changed into a prime (139347529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3667022 + ... + 3667059.

It is an arithmetic number, because the mean of its divisors is an integer number (36670410).

Almost surely, 2^139347539 is an apocalyptic number.

139347539 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

139347539 is a deficient number, since it is larger than the sum of its proper divisors (7334101).

139347539 is an equidigital number, since it uses as much as digits as its factorization.

139347539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7334100.

The product of its digits is 306180, while the sum is 44.

The square root of 139347539 is about 11804.5558578034. Note that the first 3 decimals coincide. The cubic root of 139347539 is about 518.4415109962.

It can be divided in two parts, 1393475 and 39, that multiplied together give a triangular number (54345525 = T₁₀₄₂₅).

The spelling of 139347539 in words is "one hundred thirty-nine million, three hundred forty-seven thousand, five hundred thirty-nine".