999478312 has 64 divisors (see below), whose sum is σ = 2194859520. Its totient is φ = 417788928.

The previous prime is 999478303. The next prime is 999478313. The reversal of 999478312 is 213874999.

It is a happy number.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 999478312.

It is not an unprimeable number, because it can be changed into a prime (999478313) 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, 1139218 + ... + 1140094.

It is an arithmetic number, because the mean of its divisors is an integer number (34294680).

Almost surely, 2^999478312 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 999478312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1097429760).

999478312 is an abundant number, since it is smaller than the sum of its proper divisors (1195381208).

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

999478312 is a wasteful number, since it uses less digits than its factorization.

999478312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1370 (or 1366 counting only the distinct ones).

The product of its digits is 979776, while the sum is 52.

The square root of 999478312 is about 31614.5269140628. The cubic root of 999478312 is about 999.8260737514.

The spelling of 999478312 in words is "nine hundred ninety-nine million, four hundred seventy-eight thousand, three hundred twelve".