42824813 has 2 divisors, whose sum is σ = 42824814. Its totient is φ = 42824812.

The previous prime is 42824807. The next prime is 42824839. The reversal of 42824813 is 31842824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22915369 + 19909444 = 4787^2 + 4462^2 .

It is a cyclic number.

It is not a de Polignac number, because 42824813 - 2⁴ = 42824797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42824813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42824843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21412406 + 21412407.

It is an arithmetic number, because the mean of its divisors is an integer number (21412407).

Almost surely, 2^42824813 is an apocalyptic number.

It is an amenable number.

42824813 is a deficient number, since it is larger than the sum of its proper divisors (1).

42824813 is an equidigital number, since it uses as much as digits as its factorization.

42824813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12288, while the sum is 32.

The square root of 42824813 is about 6544.0670076031. The cubic root of 42824813 is about 349.8633834157.

The spelling of 42824813 in words is "forty-two million, eight hundred twenty-four thousand, eight hundred thirteen".