1688988 has 24 divisors (see below), whose sum is σ = 4504192. Its totient is φ = 482544.

The previous prime is 1688987. The next prime is 1689031. The reversal of 1688988 is 8898861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1688987) 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, 9970 + ... + 10137.

2^1688988 is an apocalyptic number.

It is an amenable number.

1688988 is an abundant number, since it is smaller than the sum of its proper divisors (2815204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1688988 is a wasteful number, since it uses less digits than its factorization.

1688988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20121 (or 20119 counting only the distinct ones).

The product of its digits is 221184, while the sum is 48.

The square root of 1688988 is about 1299.6107109439. The cubic root of 1688988 is about 119.0900619915.

The spelling of 1688988 in words is "one million, six hundred eighty-eight thousand, nine hundred eighty-eight".