1820493 has 6 divisors (see below), whose sum is σ = 2629614. Its totient is φ = 1213656.

The previous prime is 1820471. The next prime is 1820501. The reversal of 1820493 is 3940281.

It can be written as a sum of positive squares in only one way, i.e., 1814409 + 6084 = 1347^2 + 78^2 .

It is not a de Polignac number, because 1820493 - 2⁵ = 1820461 is a prime.

1820493 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820293) 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 in 5 ways as a sum of consecutive naturals, for example, 101130 + ... + 101147.

It is an arithmetic number, because the mean of its divisors is an integer number (438269).

2^1820493 is an apocalyptic number.

It is an amenable number.

1820493 is a deficient number, since it is larger than the sum of its proper divisors (809121).

1820493 is a wasteful number, since it uses less digits than its factorization.

1820493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202283 (or 202280 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 1820493 is about 1349.2564619078. The cubic root of 1820493 is about 122.1039381199.

The spelling of 1820493 in words is "one million, eight hundred twenty thousand, four hundred ninety-three".