1818686418 has 32 divisors (see below), whose sum is σ = 3856035456. Its totient is φ = 569872128.

The previous prime is 1818686417. The next prime is 1818686447. The reversal of 1818686418 is 8146868181.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (1818686417) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76555 + ... + 97457.

It is an arithmetic number, because the mean of its divisors is an integer number (120501108).

Almost surely, 2^1818686418 is an apocalyptic number.

1818686418 is an abundant number, since it is smaller than the sum of its proper divisors (2037349038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1818686418 is a wasteful number, since it uses less digits than its factorization.

1818686418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21778.

The product of its digits is 589824, while the sum is 51.

The square root of 1818686418 is about 42646.0598179949. The cubic root of 1818686418 is about 1220.6353445172.

The spelling of 1818686418 in words is "one billion, eight hundred eighteen million, six hundred eighty-six thousand, four hundred eighteen".