999855894 has 8 divisors (see below), whose sum is σ = 1999711800. Its totient is φ = 333285296.

The previous prime is 999855893. The next prime is 999855911. The reversal of 999855894 is 498558999.

It is a sphenic number, since it is the product of 3 distinct primes.

999855894 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999855893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83321319 + ... + 83321330.

It is an arithmetic number, because the mean of its divisors is an integer number (249963975).

Almost surely, 2^999855894 is an apocalyptic number.

999855894 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

999855894 is a wasteful number, since it uses less digits than its factorization.

999855894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166642654.

The product of its digits is 41990400, while the sum is 66.

The square root of 999855894 is about 31620.4980036684. The cubic root of 999855894 is about 999.9519623591.

The spelling of 999855894 in words is "nine hundred ninety-nine million, eight hundred fifty-five thousand, eight hundred ninety-four".