420440443 has 4 divisors (see below), whose sum is σ = 420487200. Its totient is φ = 420393688.

The previous prime is 420440441. The next prime is 420440473. The reversal of 420440443 is 344044024.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 420440443 - 2¹ = 420440441 is a prime.

It is a super-2 number, since 2×420440443² = 353540332220072498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420440441) 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 3 ways as a sum of consecutive naturals, for example, 5155 + ... + 29452.

It is an arithmetic number, because the mean of its divisors is an integer number (105121800).

Almost surely, 2^420440443 is an apocalyptic number.

420440443 is a deficient number, since it is larger than the sum of its proper divisors (46757).

420440443 is a wasteful number, since it uses less digits than its factorization.

420440443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46756.

The product of its (nonzero) digits is 6144, while the sum is 25.

The square root of 420440443 is about 20504.6444251053. The cubic root of 420440443 is about 749.1489267459.

Adding to 420440443 its reverse (344044024), we get a palindrome (764484467).

The spelling of 420440443 in words is "four hundred twenty million, four hundred forty thousand, four hundred forty-three".