999669 has 8 divisors (see below), whose sum is σ = 1454112. Its totient is φ = 605840.

The previous prime is 999667. The next prime is 999671. The reversal of 999669 is 966999.

It is an interprime number because it is at equal distance from previous prime (999667) and next prime (999671).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 999669 - 2¹ = 999667 is a prime.

It is a super-2 number, since 2×999669² = 1998676219122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 999669.

It is not an unprimeable number, because it can be changed into a prime (999667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15114 + ... + 15179.

It is an arithmetic number, because the mean of its divisors is an integer number (181764).

2⁹⁹⁹⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

999669 is a deficient number, since it is larger than the sum of its proper divisors (454443).

999669 is a wasteful number, since it uses less digits than its factorization.

999669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30307.

The product of its digits is 236196, while the sum is 48.

The square root of 999669 is about 999.8344863026. The cubic root of 999669 is about 99.9889654491.

The spelling of 999669 in words is "nine hundred ninety-nine thousand, six hundred sixty-nine".