420440023 has 8 divisors (see below), whose sum is σ = 439401600. Its totient is φ = 401535288.

The previous prime is 420440003. The next prime is 420440047. The reversal of 420440023 is 320044024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 420440023 - 2¹⁷ = 420308951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420440003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1288 + ... + 29026.

It is an arithmetic number, because the mean of its divisors is an integer number (54925200).

Almost surely, 2^420440023 is an apocalyptic number.

420440023 is a deficient number, since it is larger than the sum of its proper divisors (18961577).

420440023 is a wasteful number, since it uses less digits than its factorization.

420440023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28421.

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 420440023 is about 20504.6341835206. The cubic root of 420440023 is about 749.1486772911.

Adding to 420440023 its reverse (320044024), we get a palindrome (740484047).

The spelling of 420440023 in words is "four hundred twenty million, four hundred forty thousand, twenty-three".