421405717 has 4 divisors (see below), whose sum is σ = 421881696. Its totient is φ = 420929740.

The previous prime is 421405711. The next prime is 421405729. The reversal of 421405717 is 717504124.

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 not a de Polignac number, because 421405717 - 2²³ = 413017109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421405711) 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, 236659 + ... + 238432.

It is an arithmetic number, because the mean of its divisors is an integer number (105470424).

Almost surely, 2^421405717 is an apocalyptic number.

It is an amenable number.

421405717 is a deficient number, since it is larger than the sum of its proper divisors (475979).

421405717 is an equidigital number, since it uses as much as digits as its factorization.

421405717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475978.

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 421405717 is about 20528.1688662189. The cubic root of 421405717 is about 749.7218031918.

The spelling of 421405717 in words is "four hundred twenty-one million, four hundred five thousand, seven hundred seventeen".