406139 has 8 divisors (see below), whose sum is σ = 423360. Its totient is φ = 389376.

The previous prime is 406123. The next prime is 406169. The reversal of 406139 is 931604.

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

It is a cyclic number.

It is not a de Polignac number, because 406139 - 2⁴ = 406123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4139 + ... + 4235.

It is an arithmetic number, because the mean of its divisors is an integer number (52920).

2⁴⁰⁶¹³⁹ is an apocalyptic number.

406139 is a deficient number, since it is larger than the sum of its proper divisors (17221).

406139 is an equidigital number, since it uses as much as digits as its factorization.

406139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 406139 is about 637.2903576864. The cubic root of 406139 is about 74.0556557201.

It can be divided in two parts, 406 and 139, that added together give a palindrome (545).

The spelling of 406139 in words is "four hundred six thousand, one hundred thirty-nine".