999998459 has 2 divisors, whose sum is σ = 999998460. Its totient is φ = 999998458.

The previous prime is 999998423. The next prime is 999998501. The reversal of 999998459 is 954899999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999998459 - 2⁸ = 999998203 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 999998392 and 999998401.

It is not a weakly prime, because it can be changed into another prime (999998059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999229 + 499999230.

It is an arithmetic number, because the mean of its divisors is an integer number (499999230).

Almost surely, 2^999998459 is an apocalyptic number.

999998459 is a deficient number, since it is larger than the sum of its proper divisors (1).

999998459 is an equidigital number, since it uses as much as digits as its factorization.

999998459 is an evil number, because the sum of its binary digits is even.

The product of its digits is 85030560, while the sum is 71.

The square root of 999998459 is about 31622.7522363250. The cubic root of 999998459 is about 999.9994863331. Note that the first 3 decimals are identical.

The spelling of 999998459 in words is "nine hundred ninety-nine million, nine hundred ninety-eight thousand, four hundred fifty-nine".