123198515 has 16 divisors (see below), whose sum is σ = 164712960. Its totient is φ = 87690720.

The previous prime is 123198499. The next prime is 123198539. The reversal of 123198515 is 515891321.

It is not a de Polignac number, because 123198515 - 2⁴ = 123198499 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21245 + ... + 26414.

It is an arithmetic number, because the mean of its divisors is an integer number (10294560).

Almost surely, 2^123198515 is an apocalyptic number.

123198515 is a deficient number, since it is larger than the sum of its proper divisors (41514445).

123198515 is a wasteful number, since it uses less digits than its factorization.

123198515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47722.

The product of its digits is 10800, while the sum is 35.

The square root of 123198515 is about 11099.4826456011. The cubic root of 123198515 is about 497.5863876987.

The spelling of 123198515 in words is "one hundred twenty-three million, one hundred ninety-eight thousand, five hundred fifteen".