420971643 has 6 divisors (see below), whose sum is σ = 608070164. Its totient is φ = 280647756.

The previous prime is 420971623. The next prime is 420971651. The reversal of 420971643 is 346179024.

420971643 is a `hidden beast` number, since 4 + 2 + 0 + 9 + 7 + 1 + 643 = 666.

It is not a de Polignac number, because 420971643 - 2¹⁰ = 420970619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 420971598 and 420971607.

It is not an unprimeable number, because it can be changed into a prime (420971623) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23387305 + ... + 23387322.

Almost surely, 2^420971643 is an apocalyptic number.

420971643 is a deficient number, since it is larger than the sum of its proper divisors (187098521).

420971643 is a wasteful number, since it uses less digits than its factorization.

420971643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46774633 (or 46774630 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 420971643 is about 20517.5934992386. The cubic root of 420971643 is about 749.4642947843.

The spelling of 420971643 in words is "four hundred twenty million, nine hundred seventy-one thousand, six hundred forty-three".