1800481 has 4 divisors (see below), whose sum is σ = 1803412. Its totient is φ = 1797552.

The previous prime is 1800473. The next prime is 1800493. The reversal of 1800481 is 1840081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1840081 = 251 ⋅7331.

It can be written as a sum of positive squares in 2 ways, for example, as 1245456 + 555025 = 1116^2 + 745^2 .

It is a cyclic number.

It is not a de Polignac number, because 1800481 - 2³ = 1800473 is a prime.

It is a super-2 number, since 2×1800481² = 6483463662722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1800401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150 + ... + 1903.

It is an arithmetic number, because the mean of its divisors is an integer number (450853).

2^1800481 is an apocalyptic number.

It is an amenable number.

1800481 is a deficient number, since it is larger than the sum of its proper divisors (2931).

1800481 is an equidigital number, since it uses as much as digits as its factorization.

1800481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2930.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 1800481 is about 1341.8200326422. The cubic root of 1800481 is about 121.6548742767.

The spelling of 1800481 in words is "one million, eight hundred thousand, four hundred eighty-one".