43424521 has 16 divisors (see below), whose sum is σ = 51867648. Its totient is φ = 35571600.

The previous prime is 43424503. The next prime is 43424527. The reversal of 43424521 is 12542434.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 43424521 - 2⁷ = 43424393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (43424527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16806 + ... + 19216.

It is an arithmetic number, because the mean of its divisors is an integer number (3241728).

Almost surely, 2^43424521 is an apocalyptic number.

It is an amenable number.

43424521 is a deficient number, since it is larger than the sum of its proper divisors (8443127).

43424521 is a wasteful number, since it uses less digits than its factorization.

43424521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2532.

The product of its digits is 3840, while the sum is 25.

The square root of 43424521 is about 6589.7284466054. The cubic root of 43424521 is about 351.4889520326.

Adding to 43424521 its reverse (12542434), we get a palindrome (55966955).

The spelling of 43424521 in words is "forty-three million, four hundred twenty-four thousand, five hundred twenty-one".