1866144 has 48 divisors (see below), whose sum is σ = 5600448. Its totient is φ = 532992.

The previous prime is 1866143. The next prime is 1866191. The reversal of 1866144 is 4416681.

It is a tau number, because it is divible by the number of its divisors (48).

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

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1866143) 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, 717 + ... + 2060.

It is an arithmetic number, because the mean of its divisors is an integer number (116676).

2^1866144 is an apocalyptic number.

1866144 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1866144 is an abundant number, since it is smaller than the sum of its proper divisors (3734304).

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

1866144 is a wasteful number, since it uses less digits than its factorization.

1866144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2797 (or 2789 counting only the distinct ones).

The product of its digits is 4608, while the sum is 30.

The square root of 1866144 is about 1366.0688123224. The cubic root of 1866144 is about 123.1161570431.

The spelling of 1866144 in words is "one million, eight hundred sixty-six thousand, one hundred forty-four".