656945 has 8 divisors (see below), whose sum is σ = 798336. Its totient is φ = 518896.

The previous prime is 656939. The next prime is 656951. The reversal of 656945 is 549656.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (656939) and next prime (656951).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 656945 - 2¹² = 652849 is a prime.

It is an Ulam number.

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

It is a Duffinian number.

It is a Curzon number.

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, 377 + ... + 1206.

It is an arithmetic number, because the mean of its divisors is an integer number (99792).

2⁶⁵⁶⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

656945 is a deficient number, since it is larger than the sum of its proper divisors (141391).

656945 is a wasteful number, since it uses less digits than its factorization.

656945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1671.

The product of its digits is 32400, while the sum is 35.

The square root of 656945 is about 810.5214371008. The cubic root of 656945 is about 86.9313326135.

The spelling of 656945 in words is "six hundred fifty-six thousand, nine hundred forty-five".