999885555 has 48 divisors (see below), whose sum is σ = 1835608320. Its totient is φ = 502438464.

The previous prime is 999885547. The next prime is 999885559. The reversal of 999885555 is 555588999.

It is not a de Polignac number, because 999885555 - 2³ = 999885547 is a prime.

It is a super-2 number, since 2×999885555² = 1999542246195316050, which contains 22 as substring.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 999885492 and 999885501.

It is not an unprimeable number, because it can be changed into a prime (999885559) 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 47 ways as a sum of consecutive naturals, for example, 62136 + ... + 76554.

It is an arithmetic number, because the mean of its divisors is an integer number (38241840).

Almost surely, 2^999885555 is an apocalyptic number.

999885555 is a deficient number, since it is larger than the sum of its proper divisors (835722765).

999885555 is a wasteful number, since it uses less digits than its factorization.

999885555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14520 (or 14517 counting only the distinct ones).

The product of its digits is 29160000, while the sum is 63.

The square root of 999885555 is about 31620.9670155737. The cubic root of 999885555 is about 999.9618502113.

The spelling of 999885555 in words is "nine hundred ninety-nine million, eight hundred eighty-five thousand, five hundred fifty-five".