1980922860 has 144 divisors (see below), whose sum is σ = 6900671232. Its totient is φ = 450576000.

The previous prime is 1980922829. The next prime is 1980922861. The reversal of 1980922860 is 682290891.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1980922861) 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, 262135 + ... + 269585.

It is an arithmetic number, because the mean of its divisors is an integer number (47921328).

Almost surely, 2^1980922860 is an apocalyptic number.

1980922860 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 1980922860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3450335616).

1980922860 is an abundant number, since it is smaller than the sum of its proper divisors (4919748372).

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

1980922860 is a wasteful number, since it uses less digits than its factorization.

1980922860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7684 (or 7679 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 1980922860 is about 44507.5595826147. The cubic root of 1980922860 is about 1255.9022965840.

The spelling of 1980922860 in words is "one billion, nine hundred eighty million, nine hundred twenty-two thousand, eight hundred sixty".