689961 has 8 divisors (see below), whose sum is σ = 929824. Its totient is φ = 455040.

The previous prime is 689959. The next prime is 689963. The reversal of 689961 is 169986.

It is an interprime number because it is at equal distance from previous prime (689959) and next prime (689963).

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

It is not a de Polignac number, because 689961 - 2¹ = 689959 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 689961.

It is not an unprimeable number, because it can be changed into a prime (689963) 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, 895 + ... + 1476.

It is an arithmetic number, because the mean of its divisors is an integer number (116228).

2⁶⁸⁹⁹⁶¹ is an apocalyptic number.

It is an amenable number.

689961 is a deficient number, since it is larger than the sum of its proper divisors (239863).

689961 is a wasteful number, since it uses less digits than its factorization.

689961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2471.

The product of its digits is 23328, while the sum is 39.

The square root of 689961 is about 830.6389107187. The cubic root of 689961 is about 88.3638943343.

The spelling of 689961 in words is "six hundred eighty-nine thousand, nine hundred sixty-one".