1688772 has 12 divisors (see below), whose sum is σ = 3940496. Its totient is φ = 562920.

The previous prime is 1688759. The next prime is 1688773. The reversal of 1688772 is 2778861.

It is a tau number, because it is divible by the number of its divisors (12).

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 1688772.

It is not an unprimeable number, because it can be changed into a prime (1688773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70354 + ... + 70377.

2^1688772 is an apocalyptic number.

1688772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1688772 is an abundant number, since it is smaller than the sum of its proper divisors (2251724).

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

1688772 is a wasteful number, since it uses less digits than its factorization.

1688772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140738 (or 140736 counting only the distinct ones).

The product of its digits is 37632, while the sum is 39.

The square root of 1688772 is about 1299.5276064786. The cubic root of 1688772 is about 119.0849850756.

It can be divided in two parts, 16 and 88772, that added together give a palindrome (88788).

The spelling of 1688772 in words is "one million, six hundred eighty-eight thousand, seven hundred seventy-two".