1820180485 has 4 divisors (see below), whose sum is σ = 2184216588. Its totient is φ = 1456144384.

The previous prime is 1820180399. The next prime is 1820180521. The reversal of 1820180485 is 5840810281.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1078925409 + 741255076 = 32847^2 + 27226^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1820180485 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182018044 + ... + 182018053.

It is an arithmetic number, because the mean of its divisors is an integer number (546054147).

Almost surely, 2^1820180485 is an apocalyptic number.

It is an amenable number.

1820180485 is a deficient number, since it is larger than the sum of its proper divisors (364036103).

1820180485 is an equidigital number, since it uses as much as digits as its factorization.

1820180485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364036102.

The product of its (nonzero) digits is 20480, while the sum is 37.

The square root of 1820180485 is about 42663.5732797899. The cubic root of 1820180485 is about 1220.9695072768.

The spelling of 1820180485 in words is "one billion, eight hundred twenty million, one hundred eighty thousand, four hundred eighty-five".