1820840130 has 24 divisors (see below), whose sum is σ = 4734184572. Its totient is φ = 485557344.

The previous prime is 1820840033. The next prime is 1820840159. The reversal of 1820840130 is 310480281.

It can be written as a sum of positive squares in 2 ways, for example, as 1806845049 + 13995081 = 42507^2 + 3741^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1820840094 and 1820840103.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10115689 + ... + 10115868.

Almost surely, 2^1820840130 is an apocalyptic number.

1820840130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1820840130 is an abundant number, since it is smaller than the sum of its proper divisors (2913344442).

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

1820840130 is a wasteful number, since it uses less digits than its factorization.

1820840130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20231570 (or 20231567 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 1820840130 is about 42671.3033548309. The cubic root of 1820840130 is about 1221.1169851711.

The spelling of 1820840130 in words is "one billion, eight hundred twenty million, eight hundred forty thousand, one hundred thirty".