999809946 has 16 divisors (see below), whose sum is σ = 2221800000. Its totient is φ = 333269964.

The previous prime is 999809939. The next prime is 999809957. The reversal of 999809946 is 649908999.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9257446 + ... + 9257553.

It is an arithmetic number, because the mean of its divisors is an integer number (138862500).

Almost surely, 2^999809946 is an apocalyptic number.

999809946 is an abundant number, since it is smaller than the sum of its proper divisors (1221990054).

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

999809946 is a wasteful number, since it uses less digits than its factorization.

999809946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18515010 (or 18515004 counting only the distinct ones).

The product of its (nonzero) digits is 11337408, while the sum is 63.

The square root of 999809946 is about 31619.7714412992. The cubic root of 999809946 is about 999.9366446529.

The spelling of 999809946 in words is "nine hundred ninety-nine million, eight hundred nine thousand, nine hundred forty-six".