999365 has 4 divisors (see below), whose sum is σ = 1199244. Its totient is φ = 799488.

The previous prime is 999359. The next prime is 999371. The reversal of 999365 is 563999.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (999359) and next prime (999371).

It can be written as a sum of positive squares in 2 ways, for example, as 784996 + 214369 = 886^2 + 463^2 .

It is a cyclic number.

It is not a de Polignac number, because 999365 - 2¹⁴ = 982981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99932 + ... + 99941.

It is an arithmetic number, because the mean of its divisors is an integer number (299811).

2⁹⁹⁹³⁶⁵ is an apocalyptic number.

It is an amenable number.

999365 is a deficient number, since it is larger than the sum of its proper divisors (199879).

999365 is a wasteful number, since it uses less digits than its factorization.

999365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199878.

The product of its digits is 65610, while the sum is 41.

The square root of 999365 is about 999.6824495809. The cubic root of 999365 is about 99.9788288515.

The spelling of 999365 in words is "nine hundred ninety-nine thousand, three hundred sixty-five".