1866648 has 64 divisors (see below), whose sum is σ = 5483520. Its totient is φ = 518400.

The previous prime is 1866637. The next prime is 1866649. The reversal of 1866648 is 8466681.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6753 + ... + 7023.

It is an arithmetic number, because the mean of its divisors is an integer number (85680).

2^1866648 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 1866648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2741760).

1866648 is an abundant number, since it is smaller than the sum of its proper divisors (3616872).

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

1866648 is a wasteful number, since it uses less digits than its factorization.

1866648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328 (or 324 counting only the distinct ones).

The product of its digits is 55296, while the sum is 39.

The square root of 1866648 is about 1366.2532708104. The cubic root of 1866648 is about 123.1272396030.

It can be divided in two parts, 18 and 66648, that added together give a palindrome (66666).

The spelling of 1866648 in words is "one million, eight hundred sixty-six thousand, six hundred forty-eight".