999311472 has 80 divisors (see below), whose sum is σ = 2874235680. Its totient is φ = 332425728.

The previous prime is 999311471. The next prime is 999311477. The reversal of 999311472 is 274113999.

999311472 is a `hidden beast` number, since 99 + 93 + 1 + 1 + 472 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999311471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 238548 + ... + 242700.

It is an arithmetic number, because the mean of its divisors is an integer number (35927946).

Almost surely, 2^999311472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999311472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1437117840).

999311472 is an abundant number, since it is smaller than the sum of its proper divisors (1874924208).

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

999311472 is a wasteful number, since it uses less digits than its factorization.

999311472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4727 (or 4715 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 999311472 is about 31611.8881435450. Note that the first 3 decimals coincide. The cubic root of 999311472 is about 999.7704379720.

The spelling of 999311472 in words is "nine hundred ninety-nine million, three hundred eleven thousand, four hundred seventy-two".