999886440 has 128 divisors (see below), whose sum is σ = 3437199360. Its totient is φ = 227944704.

The previous prime is 999886427. The next prime is 999886453. The reversal of 999886440 is 44688999.

999886440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (999886427) and next prime (999886453).

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 370777 + ... + 373463.

It is an arithmetic number, because the mean of its divisors is an integer number (26853120).

Almost surely, 2^999886440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999886440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1718599680).

999886440 is an abundant number, since it is smaller than the sum of its proper divisors (2437312920).

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

999886440 is a wasteful number, since it uses less digits than its factorization.

999886440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3151 (or 3147 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 57.

The square root of 999886440 is about 31620.9810094500. The cubic root of 999886440 is about 999.9621452337.

The spelling of 999886440 in words is "nine hundred ninety-nine million, eight hundred eighty-six thousand, four hundred forty".