1980045840 has 40 divisors (see below), whose sum is σ = 6138142848. Its totient is φ = 528012160.

The previous prime is 1980045839. The next prime is 1980045871. The reversal of 1980045840 is 485400891.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4124856 + ... + 4125335.

Almost surely, 2^1980045840 is an apocalyptic number.

1980045840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1980045840 is an abundant number, since it is smaller than the sum of its proper divisors (4158097008).

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

1980045840 is a wasteful number, since it uses less digits than its factorization.

1980045840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8250207 (or 8250201 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 1980045840 is about 44497.7060082877. The cubic root of 1980045840 is about 1255.7169260775.

The spelling of 1980045840 in words is "one billion, nine hundred eighty million, forty-five thousand, eight hundred forty".