656449 has 4 divisors (see below), whose sum is σ = 670464. Its totient is φ = 642436.

The previous prime is 656429. The next prime is 656459. The reversal of 656449 is 944656.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 656449 - 2⁷ = 656321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656429) 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 in 3 ways as a sum of consecutive naturals, for example, 6937 + ... + 7030.

It is an arithmetic number, because the mean of its divisors is an integer number (167616).

2⁶⁵⁶⁴⁴⁹ is an apocalyptic number.

It is an amenable number.

656449 is a deficient number, since it is larger than the sum of its proper divisors (14015).

656449 is a wasteful number, since it uses less digits than its factorization.

656449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14014.

The product of its digits is 25920, while the sum is 34.

The square root of 656449 is about 810.2154034576. The cubic root of 656449 is about 86.9094490986.

The spelling of 656449 in words is "six hundred fifty-six thousand, four hundred forty-nine".