1809043980 has 24 divisors (see below), whose sum is σ = 5065323312. Its totient is φ = 482411712.

The previous prime is 1809043939. The next prime is 1809043981. The reversal of 1809043980 is 893409081.

It is not an unprimeable number, because it can be changed into a prime (1809043981) 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, 15075307 + ... + 15075426.

It is an arithmetic number, because the mean of its divisors is an integer number (211055138).

Almost surely, 2^1809043980 is an apocalyptic number.

1809043980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1809043980 is an abundant number, since it is smaller than the sum of its proper divisors (3256279332).

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

1809043980 is a wasteful number, since it uses less digits than its factorization.

1809043980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30150745 (or 30150743 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 1809043980 is about 42532.8576514675. The cubic root of 1809043980 is about 1218.4743043978.

The spelling of 1809043980 in words is "one billion, eight hundred nine million, forty-three thousand, nine hundred eighty".