1804720325 has 12 divisors (see below), whose sum is σ = 2298336900. Its totient is φ = 1404754560.

The previous prime is 1804720297. The next prime is 1804720327. The reversal of 1804720325 is 5230274081.

It is a Cunningham number, because it is equal to 42482²+1.

It can be written as a sum of positive squares in 6 ways, for example, as 1 + 1804720324 = 1^2 + 42482^2 .

It is not a de Polignac number, because 1804720325 - 2¹⁸ = 1804458181 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1804720291 and 1804720300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1804720327) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 974600 + ... + 976449.

It is an arithmetic number, because the mean of its divisors is an integer number (191528075).

Almost surely, 2^1804720325 is an apocalyptic number.

It is an amenable number.

1804720325 is a deficient number, since it is larger than the sum of its proper divisors (493616575).

1804720325 is a wasteful number, since it uses less digits than its factorization.

1804720325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1951096 (or 1951091 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 1804720325 is about 42482.0000117697. Note that the first 4 decimals coincide. The cubic root of 1804720325 is about 1217.5028031986.

The spelling of 1804720325 in words is "one billion, eight hundred four million, seven hundred twenty thousand, three hundred twenty-five".