420644234 has 4 divisors (see below), whose sum is σ = 630966354. Its totient is φ = 210322116.

The previous prime is 420644233. The next prime is 420644251. The reversal of 420644234 is 432446024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 370447009 + 50197225 = 19247^2 + 7085^2 .

It is a junction number, because it is equal to n+sod(n) for n = 420644197 and 420644206.

It is not an unprimeable number, because it can be changed into a prime (420644233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105161057 + ... + 105161060.

Almost surely, 2^420644234 is an apocalyptic number.

420644234 is a deficient number, since it is larger than the sum of its proper divisors (210322120).

420644234 is a wasteful number, since it uses less digits than its factorization.

420644234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210322119.

The product of its (nonzero) digits is 18432, while the sum is 29.

The square root of 420644234 is about 20509.6132094196. The cubic root of 420644234 is about 749.2699467788.

The spelling of 420644234 in words is "four hundred twenty million, six hundred forty-four thousand, two hundred thirty-four".