122779879 has 4 divisors (see below), whose sum is σ = 122889760. Its totient is φ = 122670000.

The previous prime is 122779837. The next prime is 122779883. The reversal of 122779879 is 978977221.

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 122779879 - 2⁷ = 122779751 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 (122779829) 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, 53247 + ... + 55504.

It is an arithmetic number, because the mean of its divisors is an integer number (30722440).

Almost surely, 2^122779879 is an apocalyptic number.

122779879 is a deficient number, since it is larger than the sum of its proper divisors (109881).

122779879 is a wasteful number, since it uses less digits than its factorization.

122779879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109880.

The product of its digits is 889056, while the sum is 52.

The square root of 122779879 is about 11080.6082414279. The cubic root of 122779879 is about 497.0221385580.

The spelling of 122779879 in words is "one hundred twenty-two million, seven hundred seventy-nine thousand, eight hundred seventy-nine".