689942 has 12 divisors (see below), whose sum is σ = 1137948. Its totient is φ = 313500.

The previous prime is 689929. The next prime is 689951. The reversal of 689942 is 249986.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 689896 and 689905.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1184 + ... + 1667.

It is an arithmetic number, because the mean of its divisors is an integer number (94829).

2⁶⁸⁹⁹⁴² is an apocalyptic number.

689942 is a deficient number, since it is larger than the sum of its proper divisors (448006).

689942 is a wasteful number, since it uses less digits than its factorization.

689942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2875 (or 2864 counting only the distinct ones).

The product of its digits is 31104, while the sum is 38.

The square root of 689942 is about 830.6274736607. The cubic root of 689942 is about 88.3630832115.

The spelling of 689942 in words is "six hundred eighty-nine thousand, nine hundred forty-two".