420639043 has 16 divisors (see below), whose sum is σ = 487837440. Its totient is φ = 358668000.

The previous prime is 420638993. The next prime is 420639047. The reversal of 420639043 is 340936024.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420639043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 420638996 and 420639014.

It is not an unprimeable number, because it can be changed into a prime (420639047) 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, 11146 + ... + 31072.

It is an arithmetic number, because the mean of its divisors is an integer number (30489840).

Almost surely, 2^420639043 is an apocalyptic number.

420639043 is a deficient number, since it is larger than the sum of its proper divisors (67198397).

420639043 is a wasteful number, since it uses less digits than its factorization.

420639043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20058.

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 420639043 is about 20509.4866586173. The cubic root of 420639043 is about 749.2668646206.

The spelling of 420639043 in words is "four hundred twenty million, six hundred thirty-nine thousand, forty-three".