122878715 has 4 divisors (see below), whose sum is σ = 147454464. Its totient is φ = 98302968.

The previous prime is 122878711. The next prime is 122878729. The reversal of 122878715 is 517878221.

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 122878715 - 2² = 122878711 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122878711) 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 3 ways as a sum of consecutive naturals, for example, 12287867 + ... + 12287876.

It is an arithmetic number, because the mean of its divisors is an integer number (36863616).

Almost surely, 2^122878715 is an apocalyptic number.

122878715 is a deficient number, since it is larger than the sum of its proper divisors (24575749).

122878715 is an equidigital number, since it uses as much as digits as its factorization.

122878715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24575748.

The product of its digits is 62720, while the sum is 41.

The square root of 122878715 is about 11085.0672077349. The cubic root of 122878715 is about 497.1554679632.

The spelling of 122878715 in words is "one hundred twenty-two million, eight hundred seventy-eight thousand, seven hundred fifteen".