1864566 has 64 divisors (see below), whose sum is σ = 4688640. Its totient is φ = 544320.

The previous prime is 1864559. The next prime is 1864567. The reversal of 1864566 is 6654681.

1864566 is a `hidden beast` number, since 1 + 8 + 645 + 6 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1864566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1864567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25506 + ... + 25578.

It is an arithmetic number, because the mean of its divisors is an integer number (73260).

2^1864566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1864566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2344320).

1864566 is an abundant number, since it is smaller than the sum of its proper divisors (2824074).

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

1864566 is a wasteful number, since it uses less digits than its factorization.

1864566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 132 counting only the distinct ones).

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

The square root of 1864566 is about 1365.4911204398. The cubic root of 1864566 is about 123.0814451664.

The spelling of 1864566 in words is "one million, eight hundred sixty-four thousand, five hundred sixty-six".