999959556 has 24 divisors (see below), whose sum is σ = 2413696320. Its totient is φ = 321825952.

The previous prime is 999959507. The next prime is 999959557. The reversal of 999959556 is 655959999.

It is a super-2 number, since 2×999959556² = 1999838227271434272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (999959557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1436376 + ... + 1437071.

It is an arithmetic number, because the mean of its divisors is an integer number (100570680).

Almost surely, 2^999959556 is an apocalyptic number.

It is an amenable number.

999959556 is an abundant number, since it is smaller than the sum of its proper divisors (1413736764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999959556 is a wasteful number, since it uses less digits than its factorization.

999959556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2873483 (or 2873481 counting only the distinct ones).

The product of its digits is 44286750, while the sum is 66.

The square root of 999959556 is about 31622.1371194295. The cubic root of 999959556 is about 999.9865184849.

The spelling of 999959556 in words is "nine hundred ninety-nine million, nine hundred fifty-nine thousand, five hundred fifty-six".