1689636 has 24 divisors (see below), whose sum is σ = 4246144. Its totient is φ = 519840.

The previous prime is 1689617. The next prime is 1689641. The reversal of 1689636 is 6369861.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 1689594 and 1689603.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5260 + ... + 5571.

2^1689636 is an apocalyptic number.

It is an amenable number.

1689636 is an abundant number, since it is smaller than the sum of its proper divisors (2556508).

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

1689636 is a wasteful number, since it uses less digits than its factorization.

1689636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10851 (or 10849 counting only the distinct ones).

The product of its digits is 46656, while the sum is 39.

The square root of 1689636 is about 1299.8599924607. The cubic root of 1689636 is about 119.1052901425.

The spelling of 1689636 in words is "one million, six hundred eighty-nine thousand, six hundred thirty-six".