43420813 has 2 divisors, whose sum is σ = 43420814. Its totient is φ = 43420812.

The previous prime is 43420799. The next prime is 43420823. The reversal of 43420813 is 31802434.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43007364 + 413449 = 6558^2 + 643^2 .

It is a cyclic number.

It is not a de Polignac number, because 43420813 - 2⁵ = 43420781 is a prime.

It is a plaindrome in base 11.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43420823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21710406 + 21710407.

It is an arithmetic number, because the mean of its divisors is an integer number (21710407).

Almost surely, 2^43420813 is an apocalyptic number.

It is an amenable number.

43420813 is a deficient number, since it is larger than the sum of its proper divisors (1).

43420813 is an equidigital number, since it uses as much as digits as its factorization.

43420813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 43420813 is about 6589.4470936491. The cubic root of 43420813 is about 351.4789472541.

The spelling of 43420813 in words is "forty-three million, four hundred twenty thousand, eight hundred thirteen".