1988985 has 16 divisors (see below), whose sum is σ = 3217536. Its totient is φ = 1049088.

The previous prime is 1988963. The next prime is 1988999. The reversal of 1988985 is 5898891.

It is not a de Polignac number, because 1988985 - 2⁸ = 1988729 is a prime.

It is a super-2 number, since 2×1988985² = 7912122660450, which contains 22 as substring.

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 in 15 ways as a sum of consecutive naturals, for example, 772 + ... + 2138.

It is an arithmetic number, because the mean of its divisors is an integer number (201096).

2^1988985 is an apocalyptic number.

1988985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1988985 is a deficient number, since it is larger than the sum of its proper divisors (1228551).

1988985 is a wasteful number, since it uses less digits than its factorization.

1988985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1472.

The product of its digits is 207360, while the sum is 48.

The square root of 1988985 is about 1410.3137948698. The cubic root of 1988985 is about 125.7603785502.

The spelling of 1988985 in words is "one million, nine hundred eighty-eight thousand, nine hundred eighty-five".