1866546 has 36 divisors (see below), whose sum is σ = 4450446. Its totient is φ = 564960.

The previous prime is 1866521. The next prime is 1866547. The reversal of 1866546 is 6456681.

It can be written as a sum of positive squares in only one way, i.e., 1185921 + 680625 = 1089^2 + 825^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1866546.

It is not an unprimeable number, because it can be changed into a prime (1866547) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1750 + ... + 2606.

2^1866546 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1866546, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2225223).

1866546 is an abundant number, since it is smaller than the sum of its proper divisors (2583900).

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

1866546 is a wasteful number, since it uses less digits than its factorization.

1866546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887 (or 873 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 1866546 is about 1366.2159419360. The cubic root of 1866546 is about 123.1249968650.

It can be divided in two parts, 18 and 66546, that added together give a square (66564 = 258²).

The spelling of 1866546 in words is "one million, eight hundred sixty-six thousand, five hundred forty-six".