420443253 has 6 divisors (see below), whose sum is σ = 607306934. Its totient is φ = 280295496.

The previous prime is 420443251. The next prime is 420443347. The reversal of 420443253 is 352344024.

It can be written as a sum of positive squares in only one way, i.e., 418488849 + 1954404 = 20457^2 + 1398^2 .

It is not a de Polignac number, because 420443253 - 2¹ = 420443251 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 (420443251) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23357950 + ... + 23357967.

Almost surely, 2^420443253 is an apocalyptic number.

It is an amenable number.

420443253 is a deficient number, since it is larger than the sum of its proper divisors (186863681).

420443253 is a wasteful number, since it uses less digits than its factorization.

420443253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46715923 (or 46715920 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 27.

The square root of 420443253 is about 20504.7129460522. The cubic root of 420443253 is about 749.1505957130.

Adding to 420443253 its reverse (352344024), we get a palindrome (772787277).

The spelling of 420443253 in words is "four hundred twenty million, four hundred forty-three thousand, two hundred fifty-three".