1987211 has 4 divisors (see below), whose sum is σ = 1993992. Its totient is φ = 1980432.

The previous prime is 1987201. The next prime is 1987217. The reversal of 1987211 is 1127891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1987211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1987217) 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 3 ways as a sum of consecutive naturals, for example, 2930 + ... + 3543.

It is an arithmetic number, because the mean of its divisors is an integer number (498498).

2^1987211 is an apocalyptic number.

1987211 is a deficient number, since it is larger than the sum of its proper divisors (6781).

1987211 is an equidigital number, since it uses as much as digits as its factorization.

1987211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6780.

The product of its digits is 1008, while the sum is 29.

The square root of 1987211 is about 1409.6847165235. The cubic root of 1987211 is about 125.7229783565.

The spelling of 1987211 in words is "one million, nine hundred eighty-seven thousand, two hundred eleven".