1987563 has 8 divisors (see below), whose sum is σ = 2693776. Its totient is φ = 1303200.

The previous prime is 1987549. The next prime is 1987577. The reversal of 1987563 is 3657891.

It is an interprime number because it is at equal distance from previous prime (1987549) and next prime (1987577).

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

It is not a de Polignac number, because 1987563 - 2⁴ = 1987547 is a prime.

It is a d-powerful number, because it can be written as 1 + 9 + 8⁵ + 7⁴ + 5⁷ + 6⁷ + 3¹³ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1987523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5248 + ... + 5613.

It is an arithmetic number, because the mean of its divisors is an integer number (336722).

2^1987563 is an apocalyptic number.

1987563 is a deficient number, since it is larger than the sum of its proper divisors (706213).

1987563 is a wasteful number, since it uses less digits than its factorization.

1987563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10925.

The product of its digits is 45360, while the sum is 39.

The square root of 1987563 is about 1409.8095616075. The cubic root of 1987563 is about 125.7304011341.

The spelling of 1987563 in words is "one million, nine hundred eighty-seven thousand, five hundred sixty-three".