420401243 has 4 divisors (see below), whose sum is σ = 420460488. Its totient is φ = 420342000.

The previous prime is 420401227. The next prime is 420401263. The reversal of 420401243 is 342104024.

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 420401243 - 2⁴ = 420401227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420401263) 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, 17258 + ... + 33743.

It is an arithmetic number, because the mean of its divisors is an integer number (105115122).

Almost surely, 2^420401243 is an apocalyptic number.

420401243 is a deficient number, since it is larger than the sum of its proper divisors (59245).

420401243 is an equidigital number, since it uses as much as digits as its factorization.

420401243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59244.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 420401243 is about 20503.6885218246. The cubic root of 420401243 is about 749.1256435824.

Adding to 420401243 its reverse (342104024), we get a palindrome (762505267).

The spelling of 420401243 in words is "four hundred twenty million, four hundred one thousand, two hundred forty-three".