999430 has 16 divisors (see below), whose sum is σ = 1905120. Its totient is φ = 376192.

The previous prime is 999389. The next prime is 999431. The reversal of 999430 is 34999.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999431) by changing a digit.

999430 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2770 + ... + 3109.

It is an arithmetic number, because the mean of its divisors is an integer number (119070).

2⁹⁹⁹⁴³⁰ is an apocalyptic number.

999430 is a deficient number, since it is larger than the sum of its proper divisors (905690).

999430 is a wasteful number, since it uses less digits than its factorization.

999430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5903.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 999430 is about 999.7149593759. The cubic root of 999430 is about 99.9809963889.

The spelling of 999430 in words is "nine hundred ninety-nine thousand, four hundred thirty".