689944 has 8 divisors (see below), whose sum is σ = 1293660. Its totient is φ = 344968.

The previous prime is 689929. The next prime is 689951. The reversal of 689944 is 449986.

It is a tau number, because it is divible by the number of its divisors (8).

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 689897 and 689906.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43114 + ... + 43129.

2⁶⁸⁹⁹⁴⁴ is an apocalyptic number.

It is an amenable number.

689944 is a deficient number, since it is larger than the sum of its proper divisors (603716).

689944 is a wasteful number, since it uses less digits than its factorization.

689944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86249 (or 86245 counting only the distinct ones).

The product of its digits is 62208, while the sum is 40.

The square root of 689944 is about 830.6286775690. The cubic root of 689944 is about 88.3631685935.

The spelling of 689944 in words is "six hundred eighty-nine thousand, nine hundred forty-four".