1987655 has 8 divisors (see below), whose sum is σ = 2394384. Its totient is φ = 1584000.

The previous prime is 1987649. The next prime is 1987673. The reversal of 1987655 is 5567891.

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

It is not a de Polignac number, because 1987655 - 2¹⁰ = 1986631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1055 + ... + 2255.

It is an arithmetic number, because the mean of its divisors is an integer number (299298).

2^1987655 is an apocalyptic number.

1987655 is a deficient number, since it is larger than the sum of its proper divisors (406729).

1987655 is a wasteful number, since it uses less digits than its factorization.

1987655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1537.

The product of its digits is 75600, while the sum is 41.

The square root of 1987655 is about 1409.8421897503. The cubic root of 1987655 is about 125.7323410338.

The spelling of 1987655 in words is "one million, nine hundred eighty-seven thousand, six hundred fifty-five".