1666472 has 8 divisors (see below), whose sum is σ = 3124650. Its totient is φ = 833232.

The previous prime is 1666447. The next prime is 1666477. The reversal of 1666472 is 2746661.

It can be written as a sum of positive squares in only one way, i.e., 1359556 + 306916 = 1166^2 + 554^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (1666477) 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, 104147 + ... + 104162.

2^1666472 is an apocalyptic number.

It is an amenable number.

1666472 is a deficient number, since it is larger than the sum of its proper divisors (1458178).

1666472 is a wasteful number, since it uses less digits than its factorization.

1666472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208315 (or 208311 counting only the distinct ones).

The product of its digits is 12096, while the sum is 32.

The square root of 1666472 is about 1290.9190524584. The cubic root of 1666472 is about 118.5584939129.

The spelling of 1666472 in words is "one million, six hundred sixty-six thousand, four hundred seventy-two".