420730643 has 4 divisors (see below), whose sum is σ = 430992408. Its totient is φ = 410468880.

The previous prime is 420730633. The next prime is 420730649. The reversal of 420730643 is 346037024.

It is a happy number.

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 420730643 - 2⁴ = 420730627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420730649) 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, 5130821 + ... + 5130902.

It is an arithmetic number, because the mean of its divisors is an integer number (107748102).

Almost surely, 2^420730643 is an apocalyptic number.

420730643 is a deficient number, since it is larger than the sum of its proper divisors (10261765).

420730643 is a wasteful number, since it uses less digits than its factorization.

420730643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10261764.

The product of its (nonzero) digits is 12096, while the sum is 29.

The square root of 420730643 is about 20511.7196499952. The cubic root of 420730643 is about 749.3212484322.

Adding to 420730643 its reverse (346037024), we get a palindrome (766767667).

The spelling of 420730643 in words is "four hundred twenty million, seven hundred thirty thousand, six hundred forty-three".