123278915 has 8 divisors (see below), whose sum is σ = 148462848. Its totient is φ = 98271040.

The previous prime is 123278887. The next prime is 123278921. The reversal of 123278915 is 519872321.

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

It is not a de Polignac number, because 123278915 - 2⁶ = 123278851 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42467 + ... + 45276.

It is an arithmetic number, because the mean of its divisors is an integer number (18557856).

Almost surely, 2^123278915 is an apocalyptic number.

123278915 is a deficient number, since it is larger than the sum of its proper divisors (25183933).

123278915 is an equidigital number, since it uses as much as digits as its factorization.

123278915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88029.

The product of its digits is 30240, while the sum is 38.

The square root of 123278915 is about 11103.1038453218. The cubic root of 123278915 is about 497.6946066602.

The spelling of 123278915 in words is "one hundred twenty-three million, two hundred seventy-eight thousand, nine hundred fifteen".