1804644 has 18 divisors (see below), whose sum is σ = 4561830. Its totient is φ = 601536.

The previous prime is 1804643. The next prime is 1804657. The reversal of 1804644 is 4464081.

1804644 is a `hidden beast` number, since 18 + 0 + 4 + 644 = 666.

1804644 is nontrivially palindromic in base 5.

It can be written as a sum of positive squares in only one way, i.e., 1790244 + 14400 = 1338^2 + 120^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1804643) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25029 + ... + 25100.

It is an arithmetic number, because the mean of its divisors is an integer number (253435).

2^1804644 is an apocalyptic number.

It is an amenable number.

1804644 is an abundant number, since it is smaller than the sum of its proper divisors (2757186).

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

1804644 is a wasteful number, since it uses less digits than its factorization.

1804644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50139 (or 50134 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 1804644 is about 1343.3703882400. The cubic root of 1804644 is about 121.7485639466.

The spelling of 1804644 in words is "one million, eight hundred four thousand, six hundred forty-four".