1666629 has 16 divisors (see below), whose sum is σ = 2615040. Its totient is φ = 1045440.

The previous prime is 1666627. The next prime is 1666657. The reversal of 1666629 is 9266661.

It is a happy number.

It is not a de Polignac number, because 1666629 - 2¹ = 1666627 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1666593 and 1666602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666627) 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 15 ways as a sum of consecutive naturals, for example, 1357 + ... + 2274.

It is an arithmetic number, because the mean of its divisors is an integer number (163440).

2^1666629 is an apocalyptic number.

It is an amenable number.

1666629 is a deficient number, since it is larger than the sum of its proper divisors (948411).

1666629 is a wasteful number, since it uses less digits than its factorization.

1666629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3657 (or 3651 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 1666629 is about 1290.9798604161. The cubic root of 1666629 is about 118.5622169675.

The spelling of 1666629 in words is "one million, six hundred sixty-six thousand, six hundred twenty-nine".