1812640218 has 16 divisors (see below), whose sum is σ = 3626902656. Its totient is φ = 603943040.

The previous prime is 1812640201. The next prime is 1812640231. The reversal of 1812640218 is 8120462181.

It is a super-2 number, since 2×1812640218² = 6571329119822175048, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52818 + ... + 80093.

It is an arithmetic number, because the mean of its divisors is an integer number (226681416).

Almost surely, 2^1812640218 is an apocalyptic number.

1812640218 is an abundant number, since it is smaller than the sum of its proper divisors (1814262438).

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

1812640218 is a wasteful number, since it uses less digits than its factorization.

1812640218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135189.

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 1812640218 is about 42575.1126598627. The cubic root of 1812640218 is about 1219.2811805169.

The spelling of 1812640218 in words is "one billion, eight hundred twelve million, six hundred forty thousand, two hundred eighteen".