1818942893 has 2 divisors, whose sum is σ = 1818942894. Its totient is φ = 1818942892.

The previous prime is 1818942869. The next prime is 1818942899. The reversal of 1818942893 is 3982498181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1486719364 + 332223529 = 38558^2 + 18227^2 .

It is a cyclic number.

It is not a de Polignac number, because 1818942893 - 2¹⁸ = 1818680749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1818942899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 909471446 + 909471447.

It is an arithmetic number, because the mean of its divisors is an integer number (909471447).

Almost surely, 2^1818942893 is an apocalyptic number.

It is an amenable number.

1818942893 is a deficient number, since it is larger than the sum of its proper divisors (1).

1818942893 is an equidigital number, since it uses as much as digits as its factorization.

1818942893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 995328, while the sum is 53.

The square root of 1818942893 is about 42649.0667307035. The cubic root of 1818942893 is about 1220.6927206783.

The spelling of 1818942893 in words is "one billion, eight hundred eighteen million, nine hundred forty-two thousand, eight hundred ninety-three".