999859447 has 2 divisors, whose sum is σ = 999859448. Its totient is φ = 999859446.

The previous prime is 999859379. The next prime is 999859457. The reversal of 999859447 is 744958999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999859447 - 2¹⁵ = 999826679 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999859457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499929723 + 499929724.

It is an arithmetic number, because the mean of its divisors is an integer number (499929724).

Almost surely, 2^999859447 is an apocalyptic number.

999859447 is a deficient number, since it is larger than the sum of its proper divisors (1).

999859447 is an equidigital number, since it uses as much as digits as its factorization.

999859447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29393280, while the sum is 64.

The square root of 999859447 is about 31620.5541855294. The cubic root of 999859447 is about 999.9531468048.

The spelling of 999859447 in words is "nine hundred ninety-nine million, eight hundred fifty-nine thousand, four hundred forty-seven".