999866368 has 30 divisors (see below), whose sum is σ = 1999704476. Its totient is φ = 499924992.

The previous prime is 999866363. The next prime is 999866369. The reversal of 999866368 is 863668999.

It is a super-2 number, since 2×999866368² = 1999465507715022848, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is not an unprimeable number, because it can be changed into a prime (999866363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14130 + ... + 46897.

Almost surely, 2^999866368 is an apocalyptic number.

It is an amenable number.

999866368 is a deficient number, since it is larger than the sum of its proper divisors (999838108).

999866368 is an frugal number, since it uses more digits than its factorization.

999866368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61055 (or 61029 counting only the distinct ones).

The product of its digits is 30233088, while the sum is 64.

The square root of 999866368 is about 31620.6636236496. The cubic root of 999866368 is about 999.9554540157.

The spelling of 999866368 in words is "nine hundred ninety-nine million, eight hundred sixty-six thousand, three hundred sixty-eight".