1987047 has 6 divisors (see below), whose sum is σ = 2870192. Its totient is φ = 1324692.

The previous prime is 1987043. The next prime is 1987049. The reversal of 1987047 is 7407891.

It is not a de Polignac number, because 1987047 - 2² = 1987043 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 110383 + ... + 110400.

2^1987047 is an apocalyptic number.

1987047 is a deficient number, since it is larger than the sum of its proper divisors (883145).

1987047 is a wasteful number, since it uses less digits than its factorization.

1987047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220789 (or 220786 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 1987047 is about 1409.6265462881. The cubic root of 1987047 is about 125.7195197176.

The spelling of 1987047 in words is "one million, nine hundred eighty-seven thousand, forty-seven".