999964807 has 2 divisors, whose sum is σ = 999964808. Its totient is φ = 999964806.

The previous prime is 999964783. The next prime is 999964811. The reversal of 999964807 is 708469999.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999964807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999964897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499982403 + 499982404.

It is an arithmetic number, because the mean of its divisors is an integer number (499982404).

Almost surely, 2^999964807 is an apocalyptic number.

999964807 is a deficient number, since it is larger than the sum of its proper divisors (1).

999964807 is an equidigital number, since it uses as much as digits as its factorization.

999964807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8817984, while the sum is 61.

The square root of 999964807 is about 31622.2201465994. The cubic root of 999964807 is about 999.9882688624.

The spelling of 999964807 in words is "nine hundred ninety-nine million, nine hundred sixty-four thousand, eight hundred seven".