1865564 has 12 divisors (see below), whose sum is σ = 3278688. Its totient is φ = 928800.

The previous prime is 1865561. The next prime is 1865569. The reversal of 1865564 is 4655681.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1865561) 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 3 ways as a sum of consecutive naturals, for example, 224 + ... + 1944.

It is an arithmetic number, because the mean of its divisors is an integer number (273224).

2^1865564 is an apocalyptic number.

It is an amenable number.

1865564 is a deficient number, since it is larger than the sum of its proper divisors (1413124).

1865564 is a wasteful number, since it uses less digits than its factorization.

1865564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1996 (or 1994 counting only the distinct ones).

The product of its digits is 28800, while the sum is 35.

The square root of 1865564 is about 1365.8565078367. The cubic root of 1865564 is about 123.1034008338.

The spelling of 1865564 in words is "one million, eight hundred sixty-five thousand, five hundred sixty-four".