999388 has 12 divisors (see below), whose sum is σ = 1883560. Its totient is φ = 461232.

The previous prime is 999377. The next prime is 999389. The reversal of 999388 is 883999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999389) by changing a digit.

999388 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9558 + ... + 9661.

2⁹⁹⁹³⁸⁸ is an apocalyptic number.

It is an amenable number.

999388 is a deficient number, since it is larger than the sum of its proper divisors (884172).

999388 is a wasteful number, since it uses less digits than its factorization.

999388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19236 (or 19234 counting only the distinct ones).

The product of its digits is 139968, while the sum is 46.

The square root of 999388 is about 999.6939531677. The cubic root of 999388 is about 99.9795958370.

The spelling of 999388 in words is "nine hundred ninety-nine thousand, three hundred eighty-eight".