1666544 has 40 divisors (see below), whose sum is σ = 3736368. Its totient is φ = 711680.

The previous prime is 1666541. The next prime is 1666559. The reversal of 1666544 is 4456661.

It is a self number, because there is not a number n which added to its sum of digits gives 1666544.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666541) 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, 2714 + ... + 3270.

2^1666544 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 1666544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1868184).

1666544 is an abundant number, since it is smaller than the sum of its proper divisors (2069824).

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

1666544 is a wasteful number, since it uses less digits than its factorization.

1666544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593 (or 587 counting only the distinct ones).

The product of its digits is 17280, while the sum is 32.

The square root of 1666544 is about 1290.9469392659. The cubic root of 1666544 is about 118.5602013300.

It can be divided in two parts, 1666 and 544, that multiplied together give a square (906304 = 952²).

The spelling of 1666544 in words is "one million, six hundred sixty-six thousand, five hundred forty-four".