1981823460 has 48 divisors (see below), whose sum is σ = 5740459200. Its totient is φ = 510262144.

The previous prime is 1981823447. The next prime is 1981823507. The reversal of 1981823460 is 643281891.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 567750 + ... + 571229.

It is an arithmetic number, because the mean of its divisors is an integer number (119592900).

Almost surely, 2^1981823460 is an apocalyptic number.

1981823460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1981823460 is an abundant number, since it is smaller than the sum of its proper divisors (3758635740).

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

1981823460 is a wasteful number, since it uses less digits than its factorization.

1981823460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139020 (or 1139018 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 1981823460 is about 44517.6758153433. The cubic root of 1981823460 is about 1256.0925941243.

The spelling of 1981823460 in words is "one billion, nine hundred eighty-one million, eight hundred twenty-three thousand, four hundred sixty".