268388999 has 4 divisors (see below), whose sum is σ = 268620936. Its totient is φ = 268157064.

The previous prime is 268388987. The next prime is 268389007. The reversal of 268388999 is 999883862.

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 268388999 - 2⁴ = 268388983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (268348999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114224 + ... + 116549.

It is an arithmetic number, because the mean of its divisors is an integer number (67155234).

Almost surely, 2^268388999 is an apocalyptic number.

268388999 is a deficient number, since it is larger than the sum of its proper divisors (231937).

268388999 is a wasteful number, since it uses less digits than its factorization.

268388999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231936.

The product of its digits is 13436928, while the sum is 62.

The square root of 268388999 is about 16382.5821835265. The cubic root of 268388999 is about 645.0423616590.

The spelling of 268388999 in words is "two hundred sixty-eight million, three hundred eighty-eight thousand, nine hundred ninety-nine".