139157779 has 4 divisors (see below), whose sum is σ = 139338576. Its totient is φ = 138976984.

The previous prime is 139157773. The next prime is 139157803. The reversal of 139157779 is 977751931.

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 139157779 - 2¹³ = 139149587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139157773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89239 + ... + 90784.

It is an arithmetic number, because the mean of its divisors is an integer number (34834644).

Almost surely, 2^139157779 is an apocalyptic number.

139157779 is a deficient number, since it is larger than the sum of its proper divisors (180797).

139157779 is an equidigital number, since it uses as much as digits as its factorization.

139157779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180796.

The product of its digits is 416745, while the sum is 49.

The square root of 139157779 is about 11796.5155448548. The cubic root of 139157779 is about 518.2060705224.

The spelling of 139157779 in words is "one hundred thirty-nine million, one hundred fifty-seven thousand, seven hundred seventy-nine".