1666424 has 16 divisors (see below), whose sum is σ = 3172200. Its totient is φ = 820512.

The previous prime is 1666421. The next prime is 1666429. The reversal of 1666424 is 4246661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666421) 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, 1019 + ... + 2090.

2^1666424 is an apocalyptic number.

It is an amenable number.

1666424 is a deficient number, since it is larger than the sum of its proper divisors (1505776).

1666424 is a wasteful number, since it uses less digits than its factorization.

1666424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3182 (or 3178 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 1666424 is about 1290.9004609187. The cubic root of 1666424 is about 118.5573556074.

The spelling of 1666424 in words is "one million, six hundred sixty-six thousand, four hundred twenty-four".