8991915 has 16 divisors (see below), whose sum is σ = 14738976. Its totient is φ = 4678400.

The previous prime is 8991901. The next prime is 8991967. The reversal of 8991915 is 5191998.

It is not a de Polignac number, because 8991915 - 2¹¹ = 8989867 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6696 + ... + 7925.

It is an arithmetic number, because the mean of its divisors is an integer number (921186).

Almost surely, 2^8991915 is an apocalyptic number.

8991915 is a deficient number, since it is larger than the sum of its proper divisors (5747061).

8991915 is a wasteful number, since it uses less digits than its factorization.

8991915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14670.

The product of its digits is 29160, while the sum is 42.

The square root of 8991915 is about 2998.6521972380. The cubic root of 8991915 is about 207.9460766899.

The spelling of 8991915 in words is "eight million, nine hundred ninety-one thousand, nine hundred fifteen".