999272865 has 64 divisors (see below), whose sum is σ = 1707609600. Its totient is φ = 498161664.

The previous prime is 999272863. The next prime is 999272959. The reversal of 999272865 is 568272999.

It is not a de Polignac number, because 999272865 - 2¹ = 999272863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (999272863) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 2051652 + ... + 2052138.

It is an arithmetic number, because the mean of its divisors is an integer number (26681400).

Almost surely, 2^999272865 is an apocalyptic number.

It is an amenable number.

999272865 is a deficient number, since it is larger than the sum of its proper divisors (708336735).

999272865 is a wasteful number, since it uses less digits than its factorization.

999272865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666.

The product of its digits is 4898880, while the sum is 57.

The square root of 999272865 is about 31611.2774971212. The cubic root of 999272865 is about 999.7575628957.

The spelling of 999272865 in words is "nine hundred ninety-nine million, two hundred seventy-two thousand, eight hundred sixty-five".