1982385840 has 80 divisors (see below), whose sum is σ = 6249600000. Its totient is φ = 519672576.

The previous prime is 1982385803. The next prime is 1982385859. The reversal of 1982385840 is 485832891.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 1982385840.

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, 55840 + ... + 84159.

It is an arithmetic number, because the mean of its divisors is an integer number (78120000).

Almost surely, 2^1982385840 is an apocalyptic number.

1982385840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1982385840 is an abundant number, since it is smaller than the sum of its proper divisors (4267214160).

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

1982385840 is a wasteful number, since it uses less digits than its factorization.

1982385840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140074 (or 140068 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 48.

The square root of 1982385840 is about 44523.9917347940. The cubic root of 1982385840 is about 1256.2113962544.

The spelling of 1982385840 in words is "one billion, nine hundred eighty-two million, three hundred eighty-five thousand, eight hundred forty".