999399 has 8 divisors (see below), whose sum is σ = 1343232. Its totient is φ = 660920.

The previous prime is 999389. The next prime is 999431. The reversal of 999399 is 993999.

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 999399 - 2¹² = 995303 is a prime.

It is a super-2 number, since 2×999399² = 1997596722402, which contains 22 as substring.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 879 + ... + 1664.

It is an arithmetic number, because the mean of its divisors is an integer number (167904).

2⁹⁹⁹³⁹⁹ is an apocalyptic number.

999399 is a deficient number, since it is larger than the sum of its proper divisors (343833).

999399 is a wasteful number, since it uses less digits than its factorization.

999399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2677.

The product of its digits is 177147, while the sum is 48.

The square root of 999399 is about 999.6994548363. The cubic root of 999399 is about 99.9799626520.

The spelling of 999399 in words is "nine hundred ninety-nine thousand, three hundred ninety-nine".