999998956 has 72 divisors (see below), whose sum is σ = 2135246400. Its totient is φ = 405192960.

The previous prime is 999998929. The next prime is 999998957. The reversal of 999998956 is 659899999.

It is not an unprimeable number, because it can be changed into a prime (999998957) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 239535 + ... + 243673.

It is an arithmetic number, because the mean of its divisors is an integer number (29656200).

Almost surely, 2^999998956 is an apocalyptic number.

It is an amenable number.

999998956 is an abundant number, since it is smaller than the sum of its proper divisors (1135247444).

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

999998956 is a wasteful number, since it uses less digits than its factorization.

999998956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4207 (or 4188 counting only the distinct ones).

The product of its digits is 127545840, while the sum is 73.

The square root of 999998956 is about 31622.7600945901. The cubic root of 999998956 is about 999.9996519999. Note that the first 3 decimals are identical.

The spelling of 999998956 in words is "nine hundred ninety-nine million, nine hundred ninety-eight thousand, nine hundred fifty-six".