1820910493 has 12 divisors (see below), whose sum is σ = 1888979508. Its totient is φ = 1755219200.

The previous prime is 1820910473. The next prime is 1820910521. The reversal of 1820910493 is 3940190281.

It can be written as a sum of positive squares in 6 ways, for example, as 99241444 + 1721669049 = 9962^2 + 41493^2 .

It is not a de Polignac number, because 1820910493 - 2¹³ = 1820902301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820910473) 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, 648693 + ... + 651493.

It is an arithmetic number, because the mean of its divisors is an integer number (157414959).

Almost surely, 2^1820910493 is an apocalyptic number.

It is an amenable number.

1820910493 is a deficient number, since it is larger than the sum of its proper divisors (68069015).

1820910493 is an equidigital number, since it uses as much as digits as its factorization.

1820910493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3632 (or 3603 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 1820910493 is about 42672.1278236743. The cubic root of 1820910493 is about 1221.1327142378.

The spelling of 1820910493 in words is "one billion, eight hundred twenty million, nine hundred ten thousand, four hundred ninety-three".