406239 has 8 divisors (see below), whose sum is σ = 570240. Its totient is φ = 256536.

The previous prime is 406207. The next prime is 406247. The reversal of 406239 is 932604.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 406239 - 2⁵ = 406207 is a prime.

406239 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3507 + ... + 3620.

It is an arithmetic number, because the mean of its divisors is an integer number (71280).

2⁴⁰⁶²³⁹ is an apocalyptic number.

406239 is a deficient number, since it is larger than the sum of its proper divisors (164001).

406239 is a wasteful number, since it uses less digits than its factorization.

406239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7149.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 406239 is about 637.3688100307. The cubic root of 406239 is about 74.0617332435.

The spelling of 406239 in words is "four hundred six thousand, two hundred thirty-nine".