1666432 has 32 divisors (see below), whose sum is σ = 3402720. Its totient is φ = 812544.

The previous prime is 1666429. The next prime is 1666447. The reversal of 1666432 is 2346661.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×1666432² = 5553991221248, which contains 22 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1666432.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5878 + ... + 6154.

It is an arithmetic number, because the mean of its divisors is an integer number (106335).

2^1666432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1666432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1701360).

1666432 is an abundant number, since it is smaller than the sum of its proper divisors (1736288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1666432 is an equidigital number, since it uses as much as digits as its factorization.

1666432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338 (or 326 counting only the distinct ones).

The product of its digits is 5184, while the sum is 28.

The square root of 1666432 is about 1290.9035595272. The cubic root of 1666432 is about 118.5575453265.

The spelling of 1666432 in words is "one million, six hundred sixty-six thousand, four hundred thirty-two".