1987885 has 8 divisors (see below), whose sum is σ = 2443896. Its totient is φ = 1551360.

The previous prime is 1987883. The next prime is 1987889. The reversal of 1987885 is 5887891.

It can be written as a sum of positive squares in 4 ways, for example, as 58564 + 1929321 = 242^2 + 1389^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1987885 - 2¹ = 1987883 is a prime.

It is a Duffinian number.

1987885 is a lucky number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 4644 + ... + 5053.

It is an arithmetic number, because the mean of its divisors is an integer number (305487).

2^1987885 is an apocalyptic number.

It is an amenable number.

1987885 is a deficient number, since it is larger than the sum of its proper divisors (456011).

1987885 is an equidigital number, since it uses as much as digits as its factorization.

1987885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9743.

The product of its digits is 161280, while the sum is 46.

The square root of 1987885 is about 1409.9237568039. The cubic root of 1987885 is about 125.7371905211.

The spelling of 1987885 in words is "one million, nine hundred eighty-seven thousand, eight hundred eighty-five".