420304253 has 4 divisors (see below), whose sum is σ = 425624640. Its totient is φ = 414983868.

The previous prime is 420304223. The next prime is 420304319. The reversal of 420304253 is 352403024.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 420304253 - 2²⁰ = 419255677 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 (420304223) 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, 2660075 + ... + 2660232.

It is an arithmetic number, because the mean of its divisors is an integer number (106406160).

Almost surely, 2^420304253 is an apocalyptic number.

It is an amenable number.

420304253 is a deficient number, since it is larger than the sum of its proper divisors (5320387).

420304253 is an equidigital number, since it uses as much as digits as its factorization.

420304253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5320386.

The product of its (nonzero) digits is 2880, while the sum is 23.

The square root of 420304253 is about 20501.3232011985. The cubic root of 420304253 is about 749.0680293503.

Adding to 420304253 its reverse (352403024), we get a palindrome (772707277).

The spelling of 420304253 in words is "four hundred twenty million, three hundred four thousand, two hundred fifty-three".