999800407 has 2 divisors, whose sum is σ = 999800408. Its totient is φ = 999800406.

The previous prime is 999800401. The next prime is 999800411. The reversal of 999800407 is 704008999.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999800407 is a prime.

It is equal to p_50837896 and since 999800407 and 50837896 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999800401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499900203 + 499900204.

It is an arithmetic number, because the mean of its divisors is an integer number (499900204).

Almost surely, 2^999800407 is an apocalyptic number.

999800407 is a deficient number, since it is larger than the sum of its proper divisors (1).

999800407 is an equidigital number, since it uses as much as digits as its factorization.

999800407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 999800407 is about 31619.6206017719. The cubic root of 999800407 is about 999.9334645731.

The spelling of 999800407 in words is "nine hundred ninety-nine million, eight hundred thousand, four hundred seven".