2017980 has 96 divisors (see below), whose sum is σ = 6511680. Its totient is φ = 518400.

The previous prime is 2017963. The next prime is 2017987. The reversal of 2017980 is 897102.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2017987) by changing a digit.

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, 19930 + ... + 20030.

It is an arithmetic number, because the mean of its divisors is an integer number (67830).

2^2017980 is an apocalyptic number.

2017980 is a gapful number since it is divisible by the number (20) 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 2017980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3255840).

2017980 is an abundant number, since it is smaller than the sum of its proper divisors (4493700).

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

2017980 is a wasteful number, since it uses less digits than its factorization.

2017980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 2017980 is about 1420.5562290877. The cubic root of 2017980 is about 126.3685355374.

The spelling of 2017980 in words is "two million, seventeen thousand, nine hundred eighty".