999998259 has 16 divisors (see below), whose sum is σ = 1520360352. Its totient is φ = 579184128.

The previous prime is 999998243. The next prime is 999998261. The reversal of 999998259 is 952899999.

It is not a de Polignac number, because 999998259 - 2⁴ = 999998243 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 999998193 and 999998202.

It is not an unprimeable number, because it can be changed into a prime (999998269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 753484 + ... + 754809.

It is an arithmetic number, because the mean of its divisors is an integer number (95022522).

Almost surely, 2^999998259 is an apocalyptic number.

999998259 is a deficient number, since it is larger than the sum of its proper divisors (520362093).

999998259 is a wasteful number, since it uses less digits than its factorization.

999998259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1508326.

The product of its digits is 42515280, while the sum is 69.

The square root of 999998259 is about 31622.7490740448. The cubic root of 999998259 is about 999.9994196663. Note that the first 3 decimals are identical.

The spelling of 999998259 in words is "nine hundred ninety-nine million, nine hundred ninety-eight thousand, two hundred fifty-nine".