999931660 has 192 divisors, whose sum is σ = 2745630720. Its totient is φ = 297354240.

The previous prime is 999931633. The next prime is 999931711. The reversal of 999931660 is 66139999.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a junction number, because it is equal to n+sod(n) for n = 999931598 and 999931607.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2087301 + ... + 2087779.

It is an arithmetic number, because the mean of its divisors is an integer number (14300160).

Almost surely, 2^999931660 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 999931660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1372815360).

999931660 is an abundant number, since it is smaller than the sum of its proper divisors (1745699060).

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

999931660 is a wasteful number, since it uses less digits than its factorization.

999931660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576 (or 574 counting only the distinct ones).

The product of its (nonzero) digits is 708588, while the sum is 52.

The square root of 999931660 is about 31621.6960329455. The cubic root of 999931660 is about 999.9772194811.

The spelling of 999931660 in words is "nine hundred ninety-nine million, nine hundred thirty-one thousand, six hundred sixty".