999932640 has 192 divisors, whose sum is σ = 3627348480. Its totient is φ = 226805760.

The previous prime is 999932629. The next prime is 999932651. The reversal of 999932640 is 46239999.

999932640 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 (999932629) and next prime (999932651).

It is a congruent number.

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, 465970 + ... + 468110.

It is an arithmetic number, because the mean of its divisors is an integer number (18892440).

Almost surely, 2^999932640 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 999932640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1813674240).

999932640 is an abundant number, since it is smaller than the sum of its proper divisors (2627415840).

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

999932640 is a wasteful number, since it uses less digits than its factorization.

999932640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2305 (or 2297 counting only the distinct ones).

The product of its (nonzero) digits is 944784, while the sum is 51.

The square root of 999932640 is about 31621.7115286317. The cubic root of 999932640 is about 999.9775461625.

The spelling of 999932640 in words is "nine hundred ninety-nine million, nine hundred thirty-two thousand, six hundred forty".