1818396917 has 4 divisors (see below), whose sum is σ = 1836051360. Its totient is φ = 1800742476.

The previous prime is 1818396913. The next prime is 1818396953. The reversal of 1818396917 is 7196938181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7196938181 = 10429 ⋅690089.

It is a cyclic number.

It is not a de Polignac number, because 1818396917 - 2² = 1818396913 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 (1818396913) 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, 8827067 + ... + 8827272.

It is an arithmetic number, because the mean of its divisors is an integer number (459012840).

Almost surely, 2^1818396917 is an apocalyptic number.

It is an amenable number.

1818396917 is a deficient number, since it is larger than the sum of its proper divisors (17654443).

1818396917 is a wasteful number, since it uses less digits than its factorization.

1818396917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17654442.

The product of its digits is 653184, while the sum is 53.

The square root of 1818396917 is about 42642.6654537448. The cubic root of 1818396917 is about 1220.5705736105.

The spelling of 1818396917 in words is "one billion, eight hundred eighteen million, three hundred ninety-six thousand, nine hundred seventeen".