406539 has 24 divisors (see below), whose sum is σ = 698880. Its totient is φ = 231336.

The previous prime is 406531. The next prime is 406547. The reversal of 406539 is 935604.

It is a happy number.

406539 is a `hidden beast` number, since 4 + 0 + 653 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (406531) and next prime (406547).

It is not a de Polignac number, because 406539 - 2³ = 406531 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 406539.

It is not an unprimeable number, because it can be changed into a prime (406531) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1582 + ... + 1820.

It is an arithmetic number, because the mean of its divisors is an integer number (29120).

2⁴⁰⁶⁵³⁹ is an apocalyptic number.

406539 is a deficient number, since it is larger than the sum of its proper divisors (292341).

406539 is an equidigital number, since it uses as much as digits as its factorization.

406539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261 (or 249 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 406539 is about 637.6041091461. The cubic root of 406539 is about 74.0799598317.

The spelling of 406539 in words is "four hundred six thousand, five hundred thirty-nine".