999689964 has 240 divisors, whose sum is σ = 3122689248. Its totient is φ = 246564864.

The previous prime is 999689941. The next prime is 999689983. The reversal of 999689964 is 469986999.

999689964 is a modest number, since divided by 89964 gives 9996 as remainder.

It is an unprimeable number.

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 in 79 ways as a sum of consecutive naturals, for example, 6367374 + ... + 6367530.

Almost surely, 2^999689964 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 999689964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1561344624).

999689964 is an abundant number, since it is smaller than the sum of its proper divisors (2122999284).

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

999689964 is a wasteful number, since it uses less digits than its factorization.

999689964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222 (or 199 counting only the distinct ones).

The product of its digits is 68024448, while the sum is 69.

The square root of 999689964 is about 31617.8741220848. The cubic root of 999689964 is about 999.8966439846.

It can be divided in two parts, 9996 and 89964, that multiplied together give a square (899280144 = 29988²).

The spelling of 999689964 in words is "nine hundred ninety-nine million, six hundred eighty-nine thousand, nine hundred sixty-four".