689540 has 24 divisors (see below), whose sum is σ = 1512000. Its totient is φ = 263648.

The previous prime is 689509. The next prime is 689551. The reversal of 689540 is 45986.

It is a junction number, because it is equal to n+sod(n) for n = 689497 and 689506.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290 + ... + 1209.

It is an arithmetic number, because the mean of its divisors is an integer number (63000).

2⁶⁸⁹⁵⁴⁰ is an apocalyptic number.

It is an amenable number.

689540 is an abundant number, since it is smaller than the sum of its proper divisors (822460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

689540 is a wasteful number, since it uses less digits than its factorization.

689540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1531 (or 1529 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 689540 is about 830.3854526664. The cubic root of 689540 is about 88.3459180677.

The spelling of 689540 in words is "six hundred eighty-nine thousand, five hundred forty".