406438321 has 4 divisors (see below), whose sum is σ = 406498672. Its totient is φ = 406377972.

The previous prime is 406438297. The next prime is 406438337. The reversal of 406438321 is 123834604.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-406438321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406438621) 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, 18591 + ... + 34036.

It is an arithmetic number, because the mean of its divisors is an integer number (101624668).

Almost surely, 2^406438321 is an apocalyptic number.

It is an amenable number.

406438321 is a deficient number, since it is larger than the sum of its proper divisors (60351).

406438321 is an equidigital number, since it uses as much as digits as its factorization.

406438321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60350.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 406438321 is about 20160.3154985233. The cubic root of 406438321 is about 740.7384404942.

The spelling of 406438321 in words is "four hundred six million, four hundred thirty-eight thousand, three hundred twenty-one".