406436321 has 4 divisors (see below), whose sum is σ = 416349444. Its totient is φ = 396523200.

The previous prime is 406436311. The next prime is 406436369. The reversal of 406436321 is 123634604.

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

It can be written as a sum of positive squares in 2 ways, for example, as 198499921 + 207936400 = 14089^2 + 14420^2 .

It is a cyclic number.

It is not a de Polignac number, because 406436321 - 2¹⁸ = 406174177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406436311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4956500 + ... + 4956581.

It is an arithmetic number, because the mean of its divisors is an integer number (104087361).

Almost surely, 2^406436321 is an apocalyptic number.

406436321 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

406436321 is a deficient number, since it is larger than the sum of its proper divisors (9913123).

406436321 is an equidigital number, since it uses as much as digits as its factorization.

406436321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9913122.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 406436321 is about 20160.2658960640. The cubic root of 406436321 is about 740.7372254846.

It can be divided in two parts, 40643 and 6321, that added together give a palindrome (46964).

The spelling of 406436321 in words is "four hundred six million, four hundred thirty-six thousand, three hundred twenty-one".