1668984399 has 8 divisors (see below), whose sum is σ = 2472569520. Its totient is φ = 1112656248.

The previous prime is 1668984379. The next prime is 1668984431. The reversal of 1668984399 is 9934898661.

It is a happy number.

1668984399 is a `hidden beast` number, since 166 + 8 + 9 + 84 + 399 = 666.

It is not a de Polignac number, because 1668984399 - 2⁹ = 1668983887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668984379) 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 7 ways as a sum of consecutive naturals, for example, 30907092 + ... + 30907145.

It is an arithmetic number, because the mean of its divisors is an integer number (309071190).

Almost surely, 2^1668984399 is an apocalyptic number.

1668984399 is a deficient number, since it is larger than the sum of its proper divisors (803585121).

1668984399 is an equidigital number, since it uses as much as digits as its factorization.

1668984399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61814246 (or 61814240 counting only the distinct ones).

The product of its digits is 20155392, while the sum is 63.

The square root of 1668984399 is about 40853.2054923478. The cubic root of 1668984399 is about 1186.1804420383.

The spelling of 1668984399 in words is "one billion, six hundred sixty-eight million, nine hundred eighty-four thousand, three hundred ninety-nine".