1988685 has 16 divisors (see below), whose sum is σ = 3535680. Its totient is φ = 1060560.

The previous prime is 1988683. The next prime is 1988689. The reversal of 1988685 is 5868891.

It is not a de Polignac number, because 1988685 - 2¹ = 1988683 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1988685.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988683) 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 15 ways as a sum of consecutive naturals, for example, 7231 + ... + 7500.

It is an arithmetic number, because the mean of its divisors is an integer number (220980).

2^1988685 is an apocalyptic number.

1988685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1988685 is a deficient number, since it is larger than the sum of its proper divisors (1546995).

1988685 is a wasteful number, since it uses less digits than its factorization.

1988685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14745 (or 14739 counting only the distinct ones).

The product of its digits is 138240, while the sum is 45.

The square root of 1988685 is about 1410.2074315504. The cubic root of 1988685 is about 125.7540553903.

The spelling of 1988685 in words is "one million, nine hundred eighty-eight thousand, six hundred eighty-five".