406015 has 4 divisors (see below), whose sum is σ = 487224. Its totient is φ = 324808.

The previous prime is 406013. The next prime is 406027. The reversal of 406015 is 510604.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 406015 - 2¹ = 406013 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 406015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40597 + ... + 40606.

It is an arithmetic number, because the mean of its divisors is an integer number (121806).

2⁴⁰⁶⁰¹⁵ is an apocalyptic number.

406015 is a deficient number, since it is larger than the sum of its proper divisors (81209).

406015 is an equidigital number, since it uses as much as digits as its factorization.

406015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81208.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 406015 is about 637.1930633646. The cubic root of 406015 is about 74.0481182054.

Adding to 406015 its reverse (510604), we get a palindrome (916619).

The spelling of 406015 in words is "four hundred six thousand, fifteen".