139855791 has 4 divisors (see below), whose sum is σ = 186474392. Its totient is φ = 93237192.

The previous prime is 139855717. The next prime is 139855799. The reversal of 139855791 is 197558931.

139855791 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 139855791 - 2¹⁵ = 139823023 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 139855791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139855799) 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, 23309296 + ... + 23309301.

It is an arithmetic number, because the mean of its divisors is an integer number (46618598).

Almost surely, 2^139855791 is an apocalyptic number.

139855791 is a deficient number, since it is larger than the sum of its proper divisors (46618601).

139855791 is an equidigital number, since it uses as much as digits as its factorization.

139855791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46618600.

The product of its digits is 340200, while the sum is 48.

The square root of 139855791 is about 11826.0640536063. The cubic root of 139855791 is about 519.0710621768.

The spelling of 139855791 in words is "one hundred thirty-nine million, eight hundred fifty-five thousand, seven hundred ninety-one".