1849981980 has 96 divisors (see below), whose sum is σ = 6458135040. Its totient is φ = 384410880.

The previous prime is 1849981979. The next prime is 1849982003. The reversal of 1849981980 is 891899481.

It is a self number, because there is not a number n which added to its sum of digits gives 1849981980.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 195595 + ... + 204834.

It is an arithmetic number, because the mean of its divisors is an integer number (67272240).

Almost surely, 2^1849981980 is an apocalyptic number.

1849981980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1849981980 is an abundant number, since it is smaller than the sum of its proper divisors (4608153060).

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

1849981980 is a wasteful number, since it uses less digits than its factorization.

1849981980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400459 (or 400457 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 57.

The square root of 1849981980 is about 43011.4168564580. The cubic root of 1849981980 is about 1227.5970403467.

The spelling of 1849981980 in words is "one billion, eight hundred forty-nine million, nine hundred eighty-one thousand, nine hundred eighty".