1666396 has 24 divisors (see below), whose sum is σ = 3104640. Its totient is φ = 780912.

The previous prime is 1666393. The next prime is 1666397. The reversal of 1666396 is 6936661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5275 + ... + 5581.

It is an arithmetic number, because the mean of its divisors is an integer number (129360).

2^1666396 is an apocalyptic number.

It is an amenable number.

1666396 is a deficient number, since it is larger than the sum of its proper divisors (1438244).

1666396 is a wasteful number, since it uses less digits than its factorization.

1666396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393 (or 391 counting only the distinct ones).

The product of its digits is 34992, while the sum is 37.

The square root of 1666396 is about 1290.8896157302. The cubic root of 1666396 is about 118.5566915858.

The spelling of 1666396 in words is "one million, six hundred sixty-six thousand, three hundred ninety-six".