689725 has 12 divisors (see below), whose sum is σ = 874944. Its totient is φ = 539120.

The previous prime is 689723. The next prime is 689761. The reversal of 689725 is 527986.

689725 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

689725 is a nontrivial binomial coefficient, being equal to C(1175, 2).

It is not a de Polignac number, because 689725 - 2¹ = 689723 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 882 + ... + 1468.

It is an arithmetic number, because the mean of its divisors is an integer number (72912).

2⁶⁸⁹⁷²⁵ is an apocalyptic number.

689725 is the 1174-th triangular number.

689725 is the 392-nd centered nonagonal number.

It is an amenable number.

689725 is a deficient number, since it is larger than the sum of its proper divisors (185219).

689725 is a wasteful number, since it uses less digits than its factorization.

689725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644 (or 639 counting only the distinct ones).

The product of its digits is 30240, while the sum is 37.

The square root of 689725 is about 830.4968392474. The cubic root of 689725 is about 88.3538182782.

The spelling of 689725 in words is "six hundred eighty-nine thousand, seven hundred twenty-five".