999999956 has 12 divisors (see below), whose sum is σ = 1753596768. Its totient is φ = 498972312.

The previous prime is 999999937. The next prime is 1000000007. The reversal of 999999956 is 659999999.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 254726 + ... + 258621.

It is an arithmetic number, because the mean of its divisors is an integer number (146133064).

Almost surely, 2^999999956 is an apocalyptic number.

It is an amenable number.

999999956 is a deficient number, since it is larger than the sum of its proper divisors (753596812).

999999956 is a wasteful number, since it uses less digits than its factorization.

999999956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513838 (or 513836 counting only the distinct ones).

The product of its digits is 143489070, while the sum is 74.

The square root of 999999956 is about 31622.7759059827. The cubic root of 999999956 is about 999.9999853333. Note that the first 4 decimals are identical.

It can be divided in two parts, 99999995 and 6, that added together give a palindrome (100000001).

The spelling of 999999956 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred fifty-six".