1668263 has 4 divisors (see below), whose sum is σ = 1675968. Its totient is φ = 1660560.

The previous prime is 1668253. The next prime is 1668299. The reversal of 1668263 is 3628661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3628661 = 509 ⋅7129.

It is a cyclic number.

It is not a de Polignac number, because 1668263 - 2²⁰ = 619687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3518 + ... + 3963.

It is an arithmetic number, because the mean of its divisors is an integer number (418992).

2^1668263 is an apocalyptic number.

1668263 is a deficient number, since it is larger than the sum of its proper divisors (7705).

1668263 is an equidigital number, since it uses as much as digits as its factorization.

1668263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7704.

The product of its digits is 10368, while the sum is 32.

The square root of 1668263 is about 1291.6125580065. The cubic root of 1668263 is about 118.6009513198.

The spelling of 1668263 in words is "one million, six hundred sixty-eight thousand, two hundred sixty-three".