99378515 has 16 divisors (see below), whose sum is σ = 131761728. Its totient is φ = 71571456.

The previous prime is 99378511. The next prime is 99378523. The reversal of 99378515 is 51587399.

It is a cyclic number.

It is not a de Polignac number, because 99378515 - 2² = 99378511 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99378515.

It is not an unprimeable number, because it can be changed into a prime (99378511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23462 + ... + 27371.

It is an arithmetic number, because the mean of its divisors is an integer number (8235108).

Almost surely, 2^99378515 is an apocalyptic number.

99378515 is a deficient number, since it is larger than the sum of its proper divisors (32383213).

99378515 is a wasteful number, since it uses less digits than its factorization.

99378515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50878.

The product of its digits is 340200, while the sum is 47.

The square root of 99378515 is about 9968.8773189362. The cubic root of 99378515 is about 463.1953251940.

The spelling of 99378515 in words is "ninety-nine million, three hundred seventy-eight thousand, five hundred fifteen".