406556 has 24 divisors (see below), whose sum is σ = 759696. Its totient is φ = 190080.

The previous prime is 406547. The next prime is 406559. The reversal of 406556 is 655604.

It is a super-2 number, since 2×406556² = 330575562272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406559) by changing a digit.

406556 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 in 7 ways as a sum of consecutive naturals, for example, 6035 + ... + 6101.

It is an arithmetic number, because the mean of its divisors is an integer number (31654).

2⁴⁰⁶⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

406556 is a deficient number, since it is larger than the sum of its proper divisors (353140).

406556 is a wasteful number, since it uses less digits than its factorization.

406556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149 (or 147 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 406556 is about 637.6174401630. The cubic root of 406556 is about 74.0809924032.

The spelling of 406556 in words is "four hundred six thousand, five hundred fifty-six".