139781109839 has 6 divisors (see below), whose sum is σ = 162602515584. Its totient is φ = 119812379820.

The previous prime is 139781109803. The next prime is 139781109851. The reversal of 139781109839 is 938901187931.

It is a de Polignac number, because none of the positive numbers 2^k-139781109839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139781009839) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1426337807 + ... + 1426337904.

It is an arithmetic number, because the mean of its divisors is an integer number (27100419264).

Almost surely, 2^139781109839 is an apocalyptic number.

139781109839 is a deficient number, since it is larger than the sum of its proper divisors (22821405745).

139781109839 is an equidigital number, since it uses as much as digits as its factorization.

139781109839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2852675725 (or 2852675718 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 59.

The spelling of 139781109839 in words is "one hundred thirty-nine billion, seven hundred eighty-one million, one hundred nine thousand, eight hundred thirty-nine".