30420013 has 4 divisors (see below), whose sum is σ = 32760028. Its totient is φ = 28080000.

The previous prime is 30420001. The next prime is 30420023. The reversal of 30420013 is 31002403.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31002403 = 53 ⋅584951.

It can be written as a sum of positive squares in 2 ways, for example, as 14722569 + 15697444 = 3837^2 + 3962^2 .

It is not a de Polignac number, because 30420013 - 2⁵ = 30419981 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 2340001 = 30420013 / (3 + 0 + 4 + 2 + 0 + 0 + 1 + 3).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30419975 and 30420002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30420023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1169988 + ... + 1170013.

It is an arithmetic number, because the mean of its divisors is an integer number (8190007).

Almost surely, 2^30420013 is an apocalyptic number.

It is an amenable number.

30420013 is a deficient number, since it is larger than the sum of its proper divisors (2340015).

30420013 is a wasteful number, since it uses less digits than its factorization.

30420013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2340014.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 30420013 is about 5515.4340717662. The cubic root of 30420013 is about 312.1666221827.

Adding to 30420013 its reverse (31002403), we get a palindrome (61422416).

The spelling of 30420013 in words is "thirty million, four hundred twenty thousand, thirteen".