1820218404 has 24 divisors (see below), whose sum is σ = 4361965888. Its totient is φ = 590340960.

The previous prime is 1820218403. The next prime is 1820218429. The reversal of 1820218404 is 4048120281.

It is not an unprimeable number, because it can be changed into a prime (1820218403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2049352 + ... + 2050239.

Almost surely, 2^1820218404 is an apocalyptic number.

It is an amenable number.

1820218404 is an abundant number, since it is smaller than the sum of its proper divisors (2541747484).

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

1820218404 is a wasteful number, since it uses less digits than its factorization.

1820218404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4099635 (or 4099633 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 30.

The square root of 1820218404 is about 42664.0176729759. The cubic root of 1820218404 is about 1220.9779858538.

Adding to 1820218404 its reverse (4048120281), we get a palindrome (5868338685).

The spelling of 1820218404 in words is "one billion, eight hundred twenty million, two hundred eighteen thousand, four hundred four".