1668514 has 4 divisors (see below), whose sum is σ = 2502774. Its totient is φ = 834256.

The previous prime is 1668509. The next prime is 1668517. The reversal of 1668514 is 4158661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4158661 = 13 ⋅319897.

It can be written as a sum of positive squares in only one way, i.e., 1520289 + 148225 = 1233^2 + 385^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668517) 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 as a sum of consecutive naturals, namely, 417127 + ... + 417130.

2^1668514 is an apocalyptic number.

1668514 is a deficient number, since it is larger than the sum of its proper divisors (834260).

1668514 is an equidigital number, since it uses as much as digits as its factorization.

1668514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834259.

The product of its digits is 5760, while the sum is 31.

The square root of 1668514 is about 1291.7097197126. The cubic root of 1668514 is about 118.6068990922.

The spelling of 1668514 in words is "one million, six hundred sixty-eight thousand, five hundred fourteen".