421694605 has 8 divisors (see below), whose sum is σ = 535800312. Its totient is φ = 317511168.

The previous prime is 421694579. The next prime is 421694617. The reversal of 421694605 is 506496124.

It can be written as a sum of positive squares in 4 ways, for example, as 187635204 + 234059401 = 13698^2 + 15299^2 .

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 421694605 - 2⁹ = 421694093 is a prime.

It is a super-2 number, since 2×421694605² = 355652679772212050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2480472 + ... + 2480641.

It is an arithmetic number, because the mean of its divisors is an integer number (66975039).

Almost surely, 2^421694605 is an apocalyptic number.

It is an amenable number.

421694605 is a deficient number, since it is larger than the sum of its proper divisors (114105707).

421694605 is a wasteful number, since it uses less digits than its factorization.

421694605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4961135.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 421694605 is about 20535.2040408660. The cubic root of 421694605 is about 749.8930840186.

The spelling of 421694605 in words is "four hundred twenty-one million, six hundred ninety-four thousand, six hundred five".