999238320 has 120 divisors (see below), whose sum is σ = 3361774416. Its totient is φ = 265987584.

The previous prime is 999238307. The next prime is 999238379. The reversal of 999238320 is 23832999.

999238320 is a `hidden beast` number, since 9 + 99 + 238 + 320 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 613347 + ... + 614973.

Almost surely, 2^999238320 is an apocalyptic number.

999238320 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999238320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1680887208).

999238320 is an abundant number, since it is smaller than the sum of its proper divisors (2362536096).

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

999238320 is a wasteful number, since it uses less digits than its factorization.

999238320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2499 (or 2490 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The square root of 999238320 is about 31610.7310892994. The cubic root of 999238320 is about 999.7460421776.

The spelling of 999238320 in words is "nine hundred ninety-nine million, two hundred thirty-eight thousand, three hundred twenty".