406856 has 8 divisors (see below), whose sum is σ = 762870. Its totient is φ = 203424.

The previous prime is 406837. The next prime is 406859. The reversal of 406856 is 658604.

406856 is nontrivially palindromic in base 3.

It can be written as a sum of positive squares in only one way, i.e., 401956 + 4900 = 634^2 + 70^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (406859) by changing a digit.

406856 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25421 + ... + 25436.

2⁴⁰⁶⁸⁵⁶ is an apocalyptic number.

It is an amenable number.

406856 is a deficient number, since it is larger than the sum of its proper divisors (356014).

406856 is a wasteful number, since it uses less digits than its factorization.

406856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50863 (or 50859 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 406856 is about 637.8526475605. The cubic root of 406856 is about 74.0992095192.

The spelling of 406856 in words is "four hundred six thousand, eight hundred fifty-six".