43424389 has 2 divisors, whose sum is σ = 43424390. Its totient is φ = 43424388.

The previous prime is 43424383. The next prime is 43424393. The reversal of 43424389 is 98342434.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33292900 + 10131489 = 5770^2 + 3183^2 .

It is a cyclic number.

It is not a de Polignac number, because 43424389 - 2⁵ = 43424357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43424383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21712194 + 21712195.

It is an arithmetic number, because the mean of its divisors is an integer number (21712195).

Almost surely, 2^43424389 is an apocalyptic number.

It is an amenable number.

43424389 is a deficient number, since it is larger than the sum of its proper divisors (1).

43424389 is an equidigital number, since it uses as much as digits as its factorization.

43424389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 37.

The square root of 43424389 is about 6589.7184310105. The cubic root of 43424389 is about 351.4885958852.

The spelling of 43424389 in words is "forty-three million, four hundred twenty-four thousand, three hundred eighty-nine".