1987980 has 48 divisors (see below), whose sum is σ = 5896800. Its totient is φ = 498688.

The previous prime is 1987969. The next prime is 1987981. The reversal of 1987980 is 897891.

It is not an unprimeable number, because it can be changed into a prime (1987981) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 46 + ... + 1994.

It is an arithmetic number, because the mean of its divisors is an integer number (122850).

2^1987980 is an apocalyptic number.

1987980 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 1987980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2948400).

1987980 is an abundant number, since it is smaller than the sum of its proper divisors (3908820).

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

1987980 is a wasteful number, since it uses less digits than its factorization.

1987980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1978 (or 1976 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 1987980 is about 1409.9574461664. The cubic root of 1987980 is about 125.7391934610.

The spelling of 1987980 in words is "one million, nine hundred eighty-seven thousand, nine hundred eighty".