1668629 has 2 divisors, whose sum is σ = 1668630. Its totient is φ = 1668628.

The previous prime is 1668619. The next prime is 1668647. The reversal of 1668629 is 9268661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1311025 + 357604 = 1145^2 + 598^2 .

It is a cyclic number.

It is not a de Polignac number, because 1668629 - 2¹⁶ = 1603093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1668592 and 1668601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1668619) 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, 834314 + 834315.

It is an arithmetic number, because the mean of its divisors is an integer number (834315).

2^1668629 is an apocalyptic number.

It is an amenable number.

1668629 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668629 is an equidigital number, since it uses as much as digits as its factorization.

1668629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 38.

The square root of 1668629 is about 1291.7542335909. The cubic root of 1668629 is about 118.6096239679.

The spelling of 1668629 in words is "one million, six hundred sixty-eight thousand, six hundred twenty-nine".