420425171 has 4 divisors (see below), whose sum is σ = 422748144. Its totient is φ = 418102200.

The previous prime is 420425167. The next prime is 420425197. The reversal of 420425171 is 171524024.

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

It is a cyclic number.

It is not a de Polignac number, because 420425171 - 2² = 420425167 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 420425171.

It is not an unprimeable number, because it can be changed into a prime (420425771) 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, 1161215 + ... + 1161576.

It is an arithmetic number, because the mean of its divisors is an integer number (105687036).

Almost surely, 2^420425171 is an apocalyptic number.

420425171 is a deficient number, since it is larger than the sum of its proper divisors (2322973).

420425171 is a wasteful number, since it uses less digits than its factorization.

420425171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2322972.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 420425171 is about 20504.2720182893. The cubic root of 420425171 is about 749.1398559876.

Adding to 420425171 its reverse (171524024), we get a palindrome (591949195).

The spelling of 420425171 in words is "four hundred twenty million, four hundred twenty-five thousand, one hundred seventy-one".