123205077 has 8 divisors (see below), whose sum is σ = 182526080. Its totient is φ = 82136700.

The previous prime is 123205073. The next prime is 123205097. The reversal of 123205077 is 770502321.

It is not a de Polignac number, because 123205077 - 2² = 123205073 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 4563151 = 123205077 / (1 + 2 + 3 + 2 + 0 + 5 + 0 + 7 + 7).

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 123205077.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123205073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2281549 + ... + 2281602.

It is an arithmetic number, because the mean of its divisors is an integer number (22815760).

Almost surely, 2^123205077 is an apocalyptic number.

It is an amenable number.

123205077 is a deficient number, since it is larger than the sum of its proper divisors (59321003).

123205077 is an equidigital number, since it uses as much as digits as its factorization.

123205077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4563160 (or 4563154 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 123205077 is about 11099.7782410281. The cubic root of 123205077 is about 497.5952219608.

Adding to 123205077 its reverse (770502321), we get a palindrome (893707398).

It can be divided in two parts, 1 and 23205077, that added together give a triangular number (23205078 = T₆₈₁₂).

The spelling of 123205077 in words is "one hundred twenty-three million, two hundred five thousand, seventy-seven".