1980974640 has 160 divisors (see below), whose sum is σ = 6625665216. Its totient is φ = 487751680.

The previous prime is 1980974627. The next prime is 1980974687. The reversal of 1980974640 is 464790891.

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 1980974640.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 211660 + ... + 220820.

Almost surely, 2^1980974640 is an apocalyptic number.

1980974640 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 1980974640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3312832608).

1980974640 is an abundant number, since it is smaller than the sum of its proper divisors (4644690576).

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

1980974640 is a wasteful number, since it uses less digits than its factorization.

1980974640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9247 (or 9241 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 1980974640 is about 44508.1412777483. The cubic root of 1980974640 is about 1255.9132393043.

It can be divided in two parts, 19809 and 74640, that added together give a palindrome (94449).

The spelling of 1980974640 in words is "one billion, nine hundred eighty million, nine hundred seventy-four thousand, six hundred forty".