999855992 has 8 divisors (see below), whose sum is σ = 1874730000. Its totient is φ = 499927992.

The previous prime is 999855991. The next prime is 999856021. The reversal of 999855992 is 299558999.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999855991) 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 as a sum of consecutive naturals, namely, 62490992 + ... + 62491007.

It is an arithmetic number, because the mean of its divisors is an integer number (234341250).

Almost surely, 2^999855992 is an apocalyptic number.

It is an amenable number.

999855992 is a deficient number, since it is larger than the sum of its proper divisors (874874008).

999855992 is a wasteful number, since it uses less digits than its factorization.

999855992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124982005 (or 124982001 counting only the distinct ones).

The product of its digits is 23619600, while the sum is 65.

The square root of 999855992 is about 31620.4995532961. The cubic root of 999855992 is about 999.9519950289.

The spelling of 999855992 in words is "nine hundred ninety-nine million, eight hundred fifty-five thousand, nine hundred ninety-two".