999998439 has 16 divisors (see below), whose sum is σ = 1517785344. Its totient is φ = 579708800.

The previous prime is 999998423. The next prime is 999998459. The reversal of 999998439 is 934899999.

It is not a de Polignac number, because 999998439 - 2⁴ = 999998423 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999998459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 658002 + ... + 659519.

It is an arithmetic number, because the mean of its divisors is an integer number (94861584).

Almost surely, 2^999998439 is an apocalyptic number.

999998439 is a deficient number, since it is larger than the sum of its proper divisors (517786905).

999998439 is a wasteful number, since it uses less digits than its factorization.

999998439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1317558.

The product of its digits is 51018336, while the sum is 69.

The square root of 999998439 is about 31622.7519200970. The cubic root of 999998439 is about 999.9994796664. Note that the first 3 decimals are identical.

The spelling of 999998439 in words is "nine hundred ninety-nine million, nine hundred ninety-eight thousand, four hundred thirty-nine".