1668393 has 12 divisors (see below), whose sum is σ = 2424708. Its totient is φ = 1105440.

The previous prime is 1668379. The next prime is 1668427. The reversal of 1668393 is 3938661.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1411344 + 257049 = 1188^2 + 507^2 .

It is not a de Polignac number, because 1668393 - 2⁵ = 1668361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1668313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1303 + ... + 2243.

It is an arithmetic number, because the mean of its divisors is an integer number (202059).

2^1668393 is an apocalyptic number.

It is an amenable number.

1668393 is a deficient number, since it is larger than the sum of its proper divisors (756315).

1668393 is a wasteful number, since it uses less digits than its factorization.

1668393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144 (or 1141 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 1668393 is about 1291.6628817149. The cubic root of 1668393 is about 118.6040319138.

The spelling of 1668393 in words is "one million, six hundred sixty-eight thousand, three hundred ninety-three".