1987135 has 4 divisors (see below), whose sum is σ = 2384568. Its totient is φ = 1589704.

The previous prime is 1987127. The next prime is 1987151. The reversal of 1987135 is 5317891.

It is a happy number.

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 1987135 - 2³ = 1987127 is a prime.

It is a Duffinian number.

1987135 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1987135.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 198709 + ... + 198718.

It is an arithmetic number, because the mean of its divisors is an integer number (596142).

2^1987135 is an apocalyptic number.

1987135 is a deficient number, since it is larger than the sum of its proper divisors (397433).

1987135 is an equidigital number, since it uses as much as digits as its factorization.

1987135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397432.

The product of its digits is 7560, while the sum is 34.

The square root of 1987135 is about 1409.6577598836. The cubic root of 1987135 is about 125.7213755963.

The spelling of 1987135 in words is "one million, nine hundred eighty-seven thousand, one hundred thirty-five".