122780779 has 8 divisors (see below), whose sum is σ = 136793088. Its totient is φ = 109243560.

The previous prime is 122780767. The next prime is 122780803. The reversal of 122780779 is 977087221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 122780779 - 2¹⁷ = 122649707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122780719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118227 + ... + 119260.

It is an arithmetic number, because the mean of its divisors is an integer number (17099136).

Almost surely, 2^122780779 is an apocalyptic number.

122780779 is a deficient number, since it is larger than the sum of its proper divisors (14012309).

122780779 is a wasteful number, since it uses less digits than its factorization.

122780779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237545.

The product of its (nonzero) digits is 98784, while the sum is 43.

The square root of 122780779 is about 11080.6488528425. The cubic root of 122780779 is about 497.0233529775.

The spelling of 122780779 in words is "one hundred twenty-two million, seven hundred eighty thousand, seven hundred seventy-nine".