420704181 has 12 divisors (see below), whose sum is σ = 616243680. Its totient is φ = 276518760.

The previous prime is 420704177. The next prime is 420704197. The reversal of 420704181 is 181407024.

It is not a de Polignac number, because 420704181 - 2² = 420704177 is a prime.

It is a super-2 number, since 2×420704181² = 353984015821761522, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420704381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 328551 + ... + 329828.

It is an arithmetic number, because the mean of its divisors is an integer number (51353640).

Almost surely, 2^420704181 is an apocalyptic number.

It is an amenable number.

420704181 is a deficient number, since it is larger than the sum of its proper divisors (195539499).

420704181 is a wasteful number, since it uses less digits than its factorization.

420704181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658456 (or 658453 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 420704181 is about 20511.0745939846. The cubic root of 420704181 is about 749.3055384961.

The spelling of 420704181 in words is "four hundred twenty million, seven hundred four thousand, one hundred eighty-one".