656473 has 4 divisors (see below), whose sum is σ = 679140. Its totient is φ = 633808.

The previous prime is 656471. The next prime is 656479. The reversal of 656473 is 374656.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 257049 + 399424 = 507^2 + 632^2 .

It is a cyclic number.

It is not a de Polignac number, because 656473 - 2¹ = 656471 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656471) 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 3 ways as a sum of consecutive naturals, for example, 11290 + ... + 11347.

It is an arithmetic number, because the mean of its divisors is an integer number (169785).

2⁶⁵⁶⁴⁷³ is an apocalyptic number.

It is an amenable number.

656473 is a deficient number, since it is larger than the sum of its proper divisors (22667).

656473 is a wasteful number, since it uses less digits than its factorization.

656473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22666.

The product of its digits is 15120, while the sum is 31.

The square root of 656473 is about 810.2302141984. The cubic root of 656473 is about 86.9105082321.

The spelling of 656473 in words is "six hundred fifty-six thousand, four hundred seventy-three".