1988885 has 8 divisors (see below), whose sum is σ = 2419800. Its totient is φ = 1569024.

The previous prime is 1988851. The next prime is 1988887. The reversal of 1988885 is 5888891.

It can be written as a sum of positive squares in 4 ways, for example, as 31684 + 1957201 = 178^2 + 1399^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1988885 - 2¹⁶ = 1923349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2360 + ... + 3089.

It is an arithmetic number, because the mean of its divisors is an integer number (302475).

2^1988885 is an apocalyptic number.

It is an amenable number.

1988885 is a deficient number, since it is larger than the sum of its proper divisors (430915).

1988885 is an equidigital number, since it uses as much as digits as its factorization.

1988885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5527.

The product of its digits is 184320, while the sum is 47.

The square root of 1988885 is about 1410.2783413213. The cubic root of 1988885 is about 125.7582709009.

The spelling of 1988885 in words is "one million, nine hundred eighty-eight thousand, eight hundred eighty-five".