420424013 has 4 divisors (see below), whose sum is σ = 421671900. Its totient is φ = 419176128.

The previous prime is 420423989. The next prime is 420424027. The reversal of 420424013 is 310424024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 237714724 + 182709289 = 15418^2 + 13517^2 .

It is a cyclic number.

It is not a de Polignac number, because 420424013 - 2¹² = 420419917 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 (420424033) 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, 623438 + ... + 624111.

It is an arithmetic number, because the mean of its divisors is an integer number (105417975).

Almost surely, 2^420424013 is an apocalyptic number.

It is an amenable number.

420424013 is a deficient number, since it is larger than the sum of its proper divisors (1247887).

420424013 is a wasteful number, since it uses less digits than its factorization.

420424013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247886.

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

The square root of 420424013 is about 20504.2437802519. The cubic root of 420424013 is about 749.1391681880.

Adding to 420424013 its reverse (310424024), we get a palindrome (730848037).

The spelling of 420424013 in words is "four hundred twenty million, four hundred twenty-four thousand, thirteen".