1849771980 has 144 divisors (see below), whose sum is σ = 6750132480. Its totient is φ = 400546944.

The previous prime is 1849771967. The next prime is 1849771981. The reversal of 1849771980 is 891779481.

1849771980 is a `hidden beast` number, since 1 + 8 + 497 + 71 + 9 + 80 = 666.

It is not an unprimeable number, because it can be changed into a prime (1849771981) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14694 + ... + 62573.

It is an arithmetic number, because the mean of its divisors is an integer number (46875920).

Almost surely, 2^1849771980 is an apocalyptic number.

1849771980 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 1849771980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3375066240).

1849771980 is an abundant number, since it is smaller than the sum of its proper divisors (4900360500).

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

1849771980 is a wasteful number, since it uses less digits than its factorization.

1849771980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77308 (or 77303 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 54.

The square root of 1849771980 is about 43008.9755748727. The cubic root of 1849771980 is about 1227.5505885188.

The spelling of 1849771980 in words is "one billion, eight hundred forty-nine million, seven hundred seventy-one thousand, nine hundred eighty".