122878815 has 8 divisors (see below), whose sum is σ = 196606128. Its totient is φ = 65535360.

The previous prime is 122878801. The next prime is 122878837. The reversal of 122878815 is 518878221.

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

It is not a de Polignac number, because 122878815 - 2⁷ = 122878687 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 4095946 + ... + 4095975.

It is an arithmetic number, because the mean of its divisors is an integer number (24575766).

Almost surely, 2^122878815 is an apocalyptic number.

122878815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

122878815 is a deficient number, since it is larger than the sum of its proper divisors (73727313).

122878815 is an equidigital number, since it uses as much as digits as its factorization.

122878815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8191929.

The product of its digits is 71680, while the sum is 42.

The square root of 122878815 is about 11085.0717183066. The cubic root of 122878815 is about 497.1556028266.

The spelling of 122878815 in words is "one hundred twenty-two million, eight hundred seventy-eight thousand, eight hundred fifteen".