139855799 has 2 divisors, whose sum is σ = 139855800. Its totient is φ = 139855798.

The previous prime is 139855717. The next prime is 139855813. The reversal of 139855799 is 997558931.

139855799 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (997558931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139855799 - 2²⁰ = 138807223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139815799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69927899 + 69927900.

It is an arithmetic number, because the mean of its divisors is an integer number (69927900).

Almost surely, 2^139855799 is an apocalyptic number.

139855799 is a deficient number, since it is larger than the sum of its proper divisors (1).

139855799 is an equidigital number, since it uses as much as digits as its factorization.

139855799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3061800, while the sum is 56.

The square root of 139855799 is about 11826.0643918423. The cubic root of 139855799 is about 519.0710720741.

The spelling of 139855799 in words is "one hundred thirty-nine million, eight hundred fifty-five thousand, seven hundred ninety-nine".