1668633 has 4 divisors (see below), whose sum is σ = 2224848. Its totient is φ = 1112420.

The previous prime is 1668629. The next prime is 1668647. The reversal of 1668633 is 3368661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3368661 = 3 ⋅1122887.

It is a cyclic number.

It is not a de Polignac number, because 1668633 - 2² = 1668629 is a prime.

It is an Ulam number.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 1668594 and 1668603.

It is not an unprimeable number, because it can be changed into a prime (1668683) 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 3 ways as a sum of consecutive naturals, for example, 278103 + ... + 278108.

It is an arithmetic number, because the mean of its divisors is an integer number (556212).

2^1668633 is an apocalyptic number.

It is an amenable number.

1668633 is a deficient number, since it is larger than the sum of its proper divisors (556215).

1668633 is an equidigital number, since it uses as much as digits as its factorization.

1668633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556214.

The product of its digits is 15552, while the sum is 33.

The square root of 1668633 is about 1291.7557818721. The cubic root of 1668633 is about 118.6097187440.

The spelling of 1668633 in words is "one million, six hundred sixty-eight thousand, six hundred thirty-three".