999998320 has 40 divisors (see below), whose sum is σ = 2374473024. Its totient is φ = 391487232.

The previous prime is 999998309. The next prime is 999998339. The reversal of 999998320 is 23899999.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129219 + ... + 136738.

Almost surely, 2^999998320 is an apocalyptic number.

It is an amenable number.

999998320 is an abundant number, since it is smaller than the sum of its proper divisors (1374474704).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999998320 is a wasteful number, since it uses less digits than its factorization.

999998320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266017 (or 266011 counting only the distinct ones).

The product of its (nonzero) digits is 2834352, while the sum is 58.

The square root of 999998320 is about 31622.7500385403. The cubic root of 999998320 is about 999.9994399997. Note that the first 3 decimals are identical.

The spelling of 999998320 in words is "nine hundred ninety-nine million, nine hundred ninety-eight thousand, three hundred twenty".