1668428 has 24 divisors (see below), whose sum is σ = 3183600. Its totient is φ = 762048.

The previous prime is 1668427. The next prime is 1668437. The reversal of 1668428 is 8248661.

It is not an unprimeable number, because it can be changed into a prime (1668427) 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 7 ways as a sum of consecutive naturals, for example, 1826 + ... + 2582.

It is an arithmetic number, because the mean of its divisors is an integer number (132650).

2^1668428 is an apocalyptic number.

It is an amenable number.

1668428 is a deficient number, since it is larger than the sum of its proper divisors (1515172).

1668428 is a wasteful number, since it uses less digits than its factorization.

1668428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809 (or 807 counting only the distinct ones).

The product of its digits is 18432, while the sum is 35.

The square root of 1668428 is about 1291.6764300706. The cubic root of 1668428 is about 118.6048612772.

The spelling of 1668428 in words is "one million, six hundred sixty-eight thousand, four hundred twenty-eight".