1818475920 has 140 divisors (see below), whose sum is σ = 6339238236. Its totient is φ = 484911360.

The previous prime is 1818475909. The next prime is 1818475931. The reversal of 1818475920 is 295748181.

1818475920 is a `hidden beast` number, since 1 + 8 + 18 + 47 + 592 + 0 = 666.

1818475920 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1818475909) and next prime (1818475931).

It can be written as a sum of positive squares in 2 ways, for example, as 273042576 + 1545433344 = 16524^2 + 39312^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 42730 + ... + 73910.

Almost surely, 2^1818475920 is an apocalyptic number.

1818475920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1818475920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3169619118).

1818475920 is an abundant number, since it is smaller than the sum of its proper divisors (4520762316).

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

1818475920 is an equidigital number, since it uses as much as digits as its factorization.

1818475920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31212 (or 31191 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The square root of 1818475920 is about 42643.5917811809. The cubic root of 1818475920 is about 1220.5882498651.

The spelling of 1818475920 in words is "one billion, eight hundred eighteen million, four hundred seventy-five thousand, nine hundred twenty".