999356999 has 4 divisors (see below), whose sum is σ = 1002965064. Its totient is φ = 995748936.

The previous prime is 999356993. The next prime is 999357011. The reversal of 999356999 is 999653999.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 999356999 - 2⁴ = 999356983 is a prime.

It is a super-2 number, since 2×999356999² = 1997428822900572002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999356993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1803617 + ... + 1804170.

It is an arithmetic number, because the mean of its divisors is an integer number (250741266).

Almost surely, 2^999356999 is an apocalyptic number.

999356999 is a deficient number, since it is larger than the sum of its proper divisors (3608065).

999356999 is a wasteful number, since it uses less digits than its factorization.

999356999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3608064.

The product of its digits is 47829690, while the sum is 68.

The square root of 999356999 is about 31612.6082283636. The cubic root of 999356999 is about 999.7856203780.

The spelling of 999356999 in words is "nine hundred ninety-nine million, three hundred fifty-six thousand, nine hundred ninety-nine".