999432 has 64 divisors (see below), whose sum is σ = 3177600. Its totient is φ = 285120.

The previous prime is 999431. The next prime is 999433. The reversal of 999432 is 234999.

It is an interprime number because it is at equal distance from previous prime (999431) and next prime (999433).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a nialpdrome in base 10.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 999432.

It is not an unprimeable number, because it can be changed into a prime (999431) 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, 1182 + ... + 1842.

It is an arithmetic number, because the mean of its divisors is an integer number (49650).

2⁹⁹⁹⁴³² 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 999432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1588800).

999432 is an abundant number, since it is smaller than the sum of its proper divisors (2178168).

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

999432 is a wasteful number, since it uses less digits than its factorization.

999432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683 (or 673 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 999432 is about 999.7159596605. The cubic root of 999432 is about 99.9810630808.

It can be divided in two parts, 999 and 432, that added together give a triangular number (1431 = T₅₃).

The spelling of 999432 in words is "nine hundred ninety-nine thousand, four hundred thirty-two".