420181671 has 16 divisors (see below), whose sum is σ = 689529344. Its totient is φ = 221634144.

The previous prime is 420181627. The next prime is 420181709. The reversal of 420181671 is 176181024.

It is not a de Polignac number, because 420181671 - 2⁷ = 420181543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420181271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 769291 + ... + 769836.

It is an arithmetic number, because the mean of its divisors is an integer number (43095584).

Almost surely, 2^420181671 is an apocalyptic number.

420181671 is a deficient number, since it is larger than the sum of its proper divisors (269347673).

420181671 is a wasteful number, since it uses less digits than its factorization.

420181671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1539150.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 420181671 is about 20498.3333712768. Note that the first 4 decimals coincide. The cubic root of 420181671 is about 748.9952002155.

The spelling of 420181671 in words is "four hundred twenty million, one hundred eighty-one thousand, six hundred seventy-one".