1820218384 has 20 divisors (see below), whose sum is σ = 3527343184. Its totient is φ = 909936288.

The previous prime is 1820218363. The next prime is 1820218391. The reversal of 1820218384 is 4838120281.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138799 + ... + 151345.

Almost surely, 2^1820218384 is an apocalyptic number.

It is an amenable number.

1820218384 is a deficient number, since it is larger than the sum of its proper divisors (1707124800).

1820218384 is a wasteful number, since it uses less digits than its factorization.

1820218384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21622 (or 21616 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 37.

The square root of 1820218384 is about 42664.0174385863. The cubic root of 1820218384 is about 1220.9779813819.

The spelling of 1820218384 in words is "one billion, eight hundred twenty million, two hundred eighteen thousand, three hundred eighty-four".