1987567 has 4 divisors (see below), whose sum is σ = 1990440. Its totient is φ = 1984696.

The previous prime is 1987549. The next prime is 1987577. The reversal of 1987567 is 7657891.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1987567 - 2⁷ = 1987439 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 (1987537) 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, 309 + ... + 2017.

It is an arithmetic number, because the mean of its divisors is an integer number (497610).

2^1987567 is an apocalyptic number.

1987567 is a deficient number, since it is larger than the sum of its proper divisors (2873).

1987567 is a wasteful number, since it uses less digits than its factorization.

1987567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2872.

The product of its digits is 105840, while the sum is 43.

The square root of 1987567 is about 1409.8109802381. The cubic root of 1987567 is about 125.7304854788.

The spelling of 1987567 in words is "one million, nine hundred eighty-seven thousand, five hundred sixty-seven".