1800493 has 2 divisors, whose sum is σ = 1800494. Its totient is φ = 1800492.

The previous prime is 1800473. The next prime is 1800499. The reversal of 1800493 is 3940081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1483524 + 316969 = 1218^2 + 563^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1800493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1800499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 900246 + 900247.

It is an arithmetic number, because the mean of its divisors is an integer number (900247).

2^1800493 is an apocalyptic number.

It is an amenable number.

1800493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1800493 is an equidigital number, since it uses as much as digits as its factorization.

1800493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1800493 is about 1341.8245041733. The cubic root of 1800493 is about 121.6551445480.

The spelling of 1800493 in words is "one million, eight hundred thousand, four hundred ninety-three".