689973 has 8 divisors (see below), whose sum is σ = 924000. Its totient is φ = 457968.

The previous prime is 689963. The next prime is 689981. The reversal of 689973 is 379986.

It is a happy number.

689973 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 689973 - 2⁴ = 689957 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 718 + ... + 1376.

It is an arithmetic number, because the mean of its divisors is an integer number (115500).

2⁶⁸⁹⁹⁷³ is an apocalyptic number.

It is an amenable number.

689973 is a deficient number, since it is larger than the sum of its proper divisors (234027).

689973 is a wasteful number, since it uses less digits than its factorization.

689973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011.

The product of its digits is 81648, while the sum is 42.

The square root of 689973 is about 830.6461340426. The cubic root of 689973 is about 88.3644066148.

The spelling of 689973 in words is "six hundred eighty-nine thousand, nine hundred seventy-three".