1987872 has 24 divisors (see below), whose sum is σ = 5218416. Its totient is φ = 662592.

The previous prime is 1987849. The next prime is 1987873. The reversal of 1987872 is 2787891.

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (1987873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10258 + ... + 10449.

It is an arithmetic number, because the mean of its divisors is an integer number (217434).

2^1987872 is an apocalyptic number.

1987872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1987872 is an abundant number, since it is smaller than the sum of its proper divisors (3230544).

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

1987872 is a wasteful number, since it uses less digits than its factorization.

1987872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20720 (or 20712 counting only the distinct ones).

The product of its digits is 56448, while the sum is 42.

The square root of 1987872 is about 1409.9191466180. The cubic root of 1987872 is about 125.7369164296.

The spelling of 1987872 in words is "one million, nine hundred eighty-seven thousand, eight hundred seventy-two".