1987880 has 16 divisors (see below), whose sum is σ = 4472820. Its totient is φ = 795136.

The previous prime is 1987879. The next prime is 1987883. The reversal of 1987880 is 887891.

It can be written as a sum of positive squares in 2 ways, for example, as 1653796 + 334084 = 1286^2 + 578^2 .

It is not an unprimeable number, because it can be changed into a prime (1987883) 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, 24809 + ... + 24888.

2^1987880 is an apocalyptic number.

1987880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1987880 is an abundant number, since it is smaller than the sum of its proper divisors (2484940).

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

1987880 is a wasteful number, since it uses less digits than its factorization.

1987880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49708 (or 49704 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 41.

The square root of 1987880 is about 1409.9219836573. The cubic root of 1987880 is about 125.7370851014.

The spelling of 1987880 in words is "one million, nine hundred eighty-seven thousand, eight hundred eighty".