420740013 has 4 divisors (see below), whose sum is σ = 560986688. Its totient is φ = 280493340.

The previous prime is 420739973. The next prime is 420740041. The reversal of 420740013 is 310047024.

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 not a de Polignac number, because 420740013 - 2¹⁶ = 420674477 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 (420740053) 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, 70123333 + ... + 70123338.

It is an arithmetic number, because the mean of its divisors is an integer number (140246672).

Almost surely, 2^420740013 is an apocalyptic number.

It is an amenable number.

420740013 is a deficient number, since it is larger than the sum of its proper divisors (140246675).

420740013 is a wasteful number, since it uses less digits than its factorization.

420740013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140246674.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 420740013 is about 20511.9480547314. The cubic root of 420740013 is about 749.3268110474.

Adding to 420740013 its reverse (310047024), we get a palindrome (730787037).

The spelling of 420740013 in words is "four hundred twenty million, seven hundred forty thousand, thirteen".