420172183 has 4 divisors (see below), whose sum is σ = 420401520. Its totient is φ = 419942848.

The previous prime is 420172169. The next prime is 420172199. The reversal of 420172183 is 381271024.

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 420172183 - 2⁹ = 420171671 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 (420172583) 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, 111898 + ... + 115591.

It is an arithmetic number, because the mean of its divisors is an integer number (105100380).

Almost surely, 2^420172183 is an apocalyptic number.

420172183 is a deficient number, since it is larger than the sum of its proper divisors (229337).

420172183 is a wasteful number, since it uses less digits than its factorization.

420172183 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229336.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 420172183 is about 20498.1019365209. The cubic root of 420172183 is about 748.9895625588.

The spelling of 420172183 in words is "four hundred twenty million, one hundred seventy-two thousand, one hundred eighty-three".