1987071 has 4 divisors (see below), whose sum is σ = 2649432. Its totient is φ = 1324712.

The previous prime is 1987067. The next prime is 1987081. The reversal of 1987071 is 1707891.

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

It is a cyclic number.

It is not a de Polignac number, because 1987071 - 2² = 1987067 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987031) 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, 331176 + ... + 331181.

It is an arithmetic number, because the mean of its divisors is an integer number (662358).

2^1987071 is an apocalyptic number.

1987071 is a deficient number, since it is larger than the sum of its proper divisors (662361).

1987071 is an equidigital number, since it uses as much as digits as its factorization.

1987071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662360.

The product of its (nonzero) digits is 3528, while the sum is 33.

The square root of 1987071 is about 1409.6350591554. The cubic root of 1987071 is about 125.7200258718.

The spelling of 1987071 in words is "one million, nine hundred eighty-seven thousand, seventy-one".