999345 has 16 divisors (see below), whose sum is σ = 1693440. Its totient is φ = 501504.

The previous prime is 999331. The next prime is 999359. The reversal of 999345 is 543999.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (999331) and next prime (999359).

It is not a de Polignac number, because 999345 - 2⁴ = 999329 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1705 + ... + 2214.

It is an arithmetic number, because the mean of its divisors is an integer number (105840).

2⁹⁹⁹³⁴⁵ is an apocalyptic number.

It is an amenable number.

999345 is a deficient number, since it is larger than the sum of its proper divisors (694095).

999345 is a wasteful number, since it uses less digits than its factorization.

999345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3944.

The product of its digits is 43740, while the sum is 39.

The square root of 999345 is about 999.6724463543. The cubic root of 999345 is about 99.9781618980.

The spelling of 999345 in words is "nine hundred ninety-nine thousand, three hundred forty-five".