421436605 has 4 divisors (see below), whose sum is σ = 505723932. Its totient is φ = 337149280.

The previous prime is 421436597. The next prime is 421436611. The reversal of 421436605 is 506634124.

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 172712164 + 248724441 = 13142^2 + 15771^2 .

It is not a de Polignac number, because 421436605 - 2³ = 421436597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42143656 + ... + 42143665.

It is an arithmetic number, because the mean of its divisors is an integer number (126430983).

Almost surely, 2^421436605 is an apocalyptic number.

It is an amenable number.

421436605 is a deficient number, since it is larger than the sum of its proper divisors (84287327).

421436605 is an equidigital number, since it uses as much as digits as its factorization.

421436605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84287326.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 421436605 is about 20528.9211845143. The cubic root of 421436605 is about 749.7401203308.

The spelling of 421436605 in words is "four hundred twenty-one million, four hundred thirty-six thousand, six hundred five".