1988559 has 24 divisors (see below), whose sum is σ = 3135600. Its totient is φ = 1209600.

The previous prime is 1988551. The next prime is 1988561. The reversal of 1988559 is 9558891.

1988559 is a `hidden beast` number, since 1 + 98 + 8 + 559 = 666.

It is not a de Polignac number, because 1988559 - 2³ = 1988551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4759 + ... + 5159.

It is an arithmetic number, because the mean of its divisors is an integer number (130650).

2^1988559 is an apocalyptic number.

1988559 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1988559 is a deficient number, since it is larger than the sum of its proper divisors (1147041).

1988559 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (1988558) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (452).

1988559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455 (or 452 counting only the distinct ones).

The product of its digits is 129600, while the sum is 45.

The square root of 1988559 is about 1410.1627565639. The cubic root of 1988559 is about 125.7513994735.

The spelling of 1988559 in words is "one million, nine hundred eighty-eight thousand, five hundred fifty-nine".