1865984 has 36 divisors (see below), whose sum is σ = 3844764. Its totient is φ = 903168.

The previous prime is 1865959. The next prime is 1865987. The reversal of 1865984 is 4895681.

It can be written as a sum of positive squares in 2 ways, for example, as 1763584 + 102400 = 1328^2 + 320^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1865987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9374 + ... + 9570.

It is an arithmetic number, because the mean of its divisors is an integer number (106799).

2^1865984 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 1865984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1922382).

1865984 is an abundant number, since it is smaller than the sum of its proper divisors (1978780).

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

1865984 is an equidigital number, since it uses as much as digits as its factorization.

1865984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250 (or 236 counting only the distinct ones).

The product of its digits is 69120, while the sum is 41.

The square root of 1865984 is about 1366.0102488635. The cubic root of 1865984 is about 123.1126383529.

The spelling of 1865984 in words is "one million, eight hundred sixty-five thousand, nine hundred eighty-four".