999931140 has 144 divisors (see below), whose sum is σ = 3278847936. Its totient is φ = 245203200.

The previous prime is 999931139. The next prime is 999931171. The reversal of 999931140 is 41139999.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 773895 + ... + 775185.

Almost surely, 2^999931140 is an apocalyptic number.

999931140 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999931140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1639423968).

999931140 is an abundant number, since it is smaller than the sum of its proper divisors (2278916796).

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

999931140 is a wasteful number, since it uses less digits than its factorization.

999931140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1650 (or 1645 counting only the distinct ones).

The product of its (nonzero) digits is 78732, while the sum is 45.

The square root of 999931140 is about 31621.6878107415. The cubic root of 999931140 is about 999.9770461398.

The spelling of 999931140 in words is "nine hundred ninety-nine million, nine hundred thirty-one thousand, one hundred forty".