406540 has 12 divisors (see below), whose sum is σ = 853776. Its totient is φ = 162608.

The previous prime is 406531. The next prime is 406547. The reversal of 406540 is 45604.

It is not an unprimeable number, because it can be changed into a prime (406547) 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, 10144 + ... + 10183.

It is an arithmetic number, because the mean of its divisors is an integer number (71148).

2⁴⁰⁶⁵⁴⁰ is an apocalyptic number.

It is an amenable number.

406540 is an abundant number, since it is smaller than the sum of its proper divisors (447236).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

406540 is a wasteful number, since it uses less digits than its factorization.

406540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20336 (or 20334 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 406540 is about 637.6048933313. The cubic root of 406540 is about 74.0800205720.

It can be divided in two parts, 406 and 540, that added together give a triangular number (946 = T₄₃).

The spelling of 406540 in words is "four hundred six thousand, five hundred forty".