1987564 has 6 divisors (see below), whose sum is σ = 3478244. Its totient is φ = 993780.

The previous prime is 1987549. The next prime is 1987577. The reversal of 1987564 is 4657891.

It is a d-powerful number, because it can be written as 1 + 9³ + 8³ + 7⁵ + 5⁹ + 6 + 4⁷ .

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 as a sum of consecutive naturals, namely, 248442 + ... + 248449.

2^1987564 is an apocalyptic number.

It is an amenable number.

1987564 is a deficient number, since it is larger than the sum of its proper divisors (1490680).

1987564 is a wasteful number, since it uses less digits than its factorization.

1987564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496895 (or 496893 counting only the distinct ones).

The product of its digits is 60480, while the sum is 40.

The square root of 1987564 is about 1409.8099162653. The cubic root of 1987564 is about 125.7304222203.

The spelling of 1987564 in words is "one million, nine hundred eighty-seven thousand, five hundred sixty-four".