1805864 has 8 divisors (see below), whose sum is σ = 3386010. Its totient is φ = 902928.

The previous prime is 1805863. The next prime is 1805873. The reversal of 1805864 is 4685081.

It can be written as a sum of positive squares in only one way, i.e., 1800964 + 4900 = 1342^2 + 70^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1805864² = 6522289572992, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1805864.

It is not an unprimeable number, because it can be changed into a prime (1805863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112859 + ... + 112874.

2^1805864 is an apocalyptic number.

It is an amenable number.

1805864 is a deficient number, since it is larger than the sum of its proper divisors (1580146).

1805864 is a wasteful number, since it uses less digits than its factorization.

1805864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225739 (or 225735 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 1805864 is about 1343.8243932895. The cubic root of 1805864 is about 121.7759931403.

The spelling of 1805864 in words is "one million, eight hundred five thousand, eight hundred sixty-four".