1818363920 has 40 divisors (see below), whose sum is σ = 4290808704. Its totient is φ = 716487552.

The previous prime is 1818363881. The next prime is 1818363929. The reversal of 1818363920 is 293638181.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (1818363929) 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, 164264 + ... + 174983.

Almost surely, 2^1818363920 is an apocalyptic number.

1818363920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1818363920 is an abundant number, since it is smaller than the sum of its proper divisors (2472444784).

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

1818363920 is a wasteful number, since it uses less digits than its factorization.

1818363920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339327 (or 339321 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 1818363920 is about 42642.2785507529. The cubic root of 1818363920 is about 1220.5631906586.

The spelling of 1818363920 in words is "one billion, eight hundred eighteen million, three hundred sixty-three thousand, nine hundred twenty".