99915 has 8 divisors (see below), whose sum is σ = 159888. Its totient is φ = 53280.

The previous prime is 99907. The next prime is 99923. The reversal of 99915 is 51999.

It is an interprime number because it is at equal distance from previous prime (99907) and next prime (99923).

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

It is not a de Polignac number, because 99915 - 2³ = 99907 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3316 + ... + 3345.

It is an arithmetic number, because the mean of its divisors is an integer number (19986).

2⁹⁹⁹¹⁵ is an apocalyptic number.

99915 is a deficient number, since it is larger than the sum of its proper divisors (59973).

99915 is a wasteful number, since it uses less digits than its factorization.

99915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6669.

The product of its digits is 3645, while the sum is 33.

The square root of 99915 is about 316.0933406448. The cubic root of 99915 is about 46.4027334398.

The spelling of 99915 in words is "ninety-nine thousand, nine hundred fifteen".