656842 has 4 divisors (see below), whose sum is σ = 985266. Its totient is φ = 328420.

The previous prime is 656839. The next prime is 656891. The reversal of 656842 is 248656.

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

It can be written as a sum of positive squares in only one way, i.e., 505521 + 151321 = 711^2 + 389^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164209 + ... + 164212.

2⁶⁵⁶⁸⁴² is an apocalyptic number.

656842 is a deficient number, since it is larger than the sum of its proper divisors (328424).

656842 is a wasteful number, since it uses less digits than its factorization.

656842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328423.

The product of its digits is 11520, while the sum is 31.

The square root of 656842 is about 810.4578952666. The cubic root of 656842 is about 86.9267891609.

The spelling of 656842 in words is "six hundred fifty-six thousand, eight hundred forty-two".