99870915 has 16 divisors (see below), whose sum is σ = 160777728. Its totient is φ = 52936416.

The previous prime is 99870877. The next prime is 99870919. The reversal of 99870915 is 51907899.

It is not a de Polignac number, because 99870915 - 2⁷ = 99870787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99870919) 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, 17979 + ... + 22868.

It is an arithmetic number, because the mean of its divisors is an integer number (10048608).

Almost surely, 2^99870915 is an apocalyptic number.

99870915 is a deficient number, since it is larger than the sum of its proper divisors (60906813).

99870915 is a wasteful number, since it uses less digits than its factorization.

99870915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41018.

The product of its (nonzero) digits is 204120, while the sum is 48.

The square root of 99870915 is about 9993.5436657874. The cubic root of 99870915 is about 463.9590775320.

The spelling of 99870915 in words is "ninety-nine million, eight hundred seventy thousand, nine hundred fifteen".