656489 has 12 divisors (see below), whose sum is σ = 736596. Its totient is φ = 582912.

The previous prime is 656483. The next prime is 656519. The reversal of 656489 is 984656.

656489 = T₁₀₂ + T₁₀₃ + ... + T₁₇₀.

It can be written as a sum of positive squares in 2 ways, for example, as 444889 + 211600 = 667^2 + 460^2 .

It is a de Polignac number, because none of the positive numbers 2^k-656489 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 (656483) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 8957 + ... + 9029.

It is an arithmetic number, because the mean of its divisors is an integer number (61383).

2⁶⁵⁶⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

656489 is a deficient number, since it is larger than the sum of its proper divisors (80107).

656489 is a wasteful number, since it uses less digits than its factorization.

656489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136 (or 113 counting only the distinct ones).

The product of its digits is 51840, while the sum is 38.

The square root of 656489 is about 810.2400878752. The cubic root of 656489 is about 86.9112143067.

The spelling of 656489 in words is "six hundred fifty-six thousand, four hundred eighty-nine".