1866816 has 84 divisors (see below), whose sum is σ = 6128512. Its totient is φ = 532224.

The previous prime is 1866779. The next prime is 1866827. The reversal of 1866816 is 6186681.

It is a tau number, because it is divible by the number of its divisors (84).

It is a Harshad number since it is a multiple of its sum of digits (36).

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3801 + ... + 4263.

2^1866816 is an apocalyptic number.

1866816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1866816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3064256).

1866816 is an abundant number, since it is smaller than the sum of its proper divisors (4261696).

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

1866816 is a wasteful number, since it uses less digits than its factorization.

1866816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488 (or 475 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 1866816 is about 1366.3147514391. The cubic root of 1866816 is about 123.1309333463.

The spelling of 1866816 in words is "one million, eight hundred sixty-six thousand, eight hundred sixteen".