656389 has 2 divisors, whose sum is σ = 656390. Its totient is φ = 656388.

The previous prime is 656377. The next prime is 656407. The reversal of 656389 is 983656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 656100 + 289 = 810^2 + 17^2 .

It is a cyclic number.

It is not a de Polignac number, because 656389 - 2¹⁵ = 623621 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328194 + 328195.

It is an arithmetic number, because the mean of its divisors is an integer number (328195).

2⁶⁵⁶³⁸⁹ is an apocalyptic number.

It is an amenable number.

656389 is a deficient number, since it is larger than the sum of its proper divisors (1).

656389 is an equidigital number, since it uses as much as digits as its factorization.

656389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 37.

The square root of 656389 is about 810.1783754211. The cubic root of 656389 is about 86.9068011519.

The spelling of 656389 in words is "six hundred fifty-six thousand, three hundred eighty-nine".