43420145 has 4 divisors (see below), whose sum is σ = 52104180. Its totient is φ = 34736112.

The previous prime is 43420133. The next prime is 43420199. The reversal of 43420145 is 54102434.

43420145 = T₄₁₆₅ + T₄₁₆₆ + ... + T₄₁₆₉.

43420145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54102434 = 2 ⋅27051217.

It can be written as a sum of positive squares in 2 ways, for example, as 13126129 + 30294016 = 3623^2 + 5504^2 .

It is a cyclic number.

It is not a de Polignac number, because 43420145 - 2¹² = 43416049 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43420145.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4342010 + ... + 4342019.

It is an arithmetic number, because the mean of its divisors is an integer number (13026045).

Almost surely, 2^43420145 is an apocalyptic number.

It is an amenable number.

43420145 is a deficient number, since it is larger than the sum of its proper divisors (8684035).

43420145 is an equidigital number, since it uses as much as digits as its factorization.

43420145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8684034.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 43420145 is about 6589.3964063486. The cubic root of 43420145 is about 351.4771448225.

Adding to 43420145 its reverse (54102434), we get a palindrome (97522579).

The spelling of 43420145 in words is "forty-three million, four hundred twenty thousand, one hundred forty-five".