1818996859 has 4 divisors (see below), whose sum is σ = 1821246120. Its totient is φ = 1816747600.

The previous prime is 1818996853. The next prime is 1818996871. The reversal of 1818996859 is 9586998181.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1818996859 - 2⁷ = 1818996731 is a prime.

It is a super-3 number, since 3×1818996859³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1818996859.

It is not an unprimeable number, because it can be changed into a prime (1818996853) 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, 1123417 + ... + 1125034.

It is an arithmetic number, because the mean of its divisors is an integer number (455311530).

Almost surely, 2^1818996859 is an apocalyptic number.

1818996859 is a deficient number, since it is larger than the sum of its proper divisors (2249261).

1818996859 is an equidigital number, since it uses as much as digits as its factorization.

1818996859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2249260.

The product of its digits is 11197440, while the sum is 64.

The square root of 1818996859 is about 42649.6994010509. The cubic root of 1818996859 is about 1220.7047927546.

The spelling of 1818996859 in words is "one billion, eight hundred eighteen million, nine hundred ninety-six thousand, eight hundred fifty-nine".