139206077 has 4 divisors (see below), whose sum is σ = 139281660. Its totient is φ = 139130496.

The previous prime is 139206071. The next prime is 139206107. The reversal of 139206077 is 770602931.

139206077 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 can be written as a sum of positive squares in 2 ways, for example, as 57592921 + 81613156 = 7589^2 + 9034^2 .

It is a cyclic number.

It is not a de Polignac number, because 139206077 - 2¹² = 139201981 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 (139206071) 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, 34958 + ... + 38735.

It is an arithmetic number, because the mean of its divisors is an integer number (34820415).

Almost surely, 2^139206077 is an apocalyptic number.

It is an amenable number.

139206077 is a deficient number, since it is larger than the sum of its proper divisors (75583).

139206077 is an equidigital number, since it uses as much as digits as its factorization.

139206077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75582.

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 139206077 is about 11798.5624971858. The cubic root of 139206077 is about 518.2660154807.

The spelling of 139206077 in words is "one hundred thirty-nine million, two hundred six thousand, seventy-seven".