1818913 has 4 divisors (see below), whose sum is σ = 1825668. Its totient is φ = 1812160.

The previous prime is 1818871. The next prime is 1818919. The reversal of 1818913 is 3198181.

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 762129 + 1056784 = 873^2 + 1028^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1818913 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1818919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2956 + ... + 3517.

It is an arithmetic number, because the mean of its divisors is an integer number (456417).

2^1818913 is an apocalyptic number.

It is an amenable number.

1818913 is a deficient number, since it is larger than the sum of its proper divisors (6755).

1818913 is an equidigital number, since it uses as much as digits as its factorization.

1818913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6754.

The product of its digits is 1728, while the sum is 31.

The square root of 1818913 is about 1348.6708271480. The cubic root of 1818913 is about 122.0686033577.

The spelling of 1818913 in words is "one million, eight hundred eighteen thousand, nine hundred thirteen".