139540277 has 4 divisors (see below), whose sum is σ = 139594860. Its totient is φ = 139485696.

The previous prime is 139540273. The next prime is 139540309. The reversal of 139540277 is 772045931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 772045931 = 8963 ⋅86137.

It can be written as a sum of positive squares in 2 ways, for example, as 7612081 + 131928196 = 2759^2 + 11486^2 .

It is a cyclic number.

It is not a de Polignac number, because 139540277 - 2² = 139540273 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 139540277.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139540273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23258 + ... + 28635.

It is an arithmetic number, because the mean of its divisors is an integer number (34898715).

Almost surely, 2^139540277 is an apocalyptic number.

It is an amenable number.

139540277 is a deficient number, since it is larger than the sum of its proper divisors (54583).

139540277 is an equidigital number, since it uses as much as digits as its factorization.

139540277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54582.

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 139540277 is about 11812.7167493342. The cubic root of 139540277 is about 518.6804276562.

The spelling of 139540277 in words is "one hundred thirty-nine million, five hundred forty thousand, two hundred seventy-seven".