1805564 has 12 divisors (see below), whose sum is σ = 3261888. Its totient is φ = 873600.

The previous prime is 1805561. The next prime is 1805579. The reversal of 1805564 is 4655081.

It is a happy number.

It is a super-2 number, since 2×1805564² = 6520122716192, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1805561) 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, 7157 + ... + 7404.

It is an arithmetic number, because the mean of its divisors is an integer number (271824).

2^1805564 is an apocalyptic number.

It is an amenable number.

1805564 is a deficient number, since it is larger than the sum of its proper divisors (1456324).

1805564 is a wasteful number, since it uses less digits than its factorization.

1805564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14596 (or 14594 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 1805564 is about 1343.7127669260. The cubic root of 1805564 is about 121.7692494023.

The spelling of 1805564 in words is "one million, eight hundred five thousand, five hundred sixty-four".