43434521 has 12 divisors (see below), whose sum is σ = 47361132. Its totient is φ = 39813696.

The previous prime is 43434509. The next prime is 43434569. The reversal of 43434521 is 12543434.

It can be written as a sum of positive squares in 6 ways, for example, as 22458121 + 20976400 = 4739^2 + 4580^2 .

It is not a de Polignac number, because 43434521 - 2¹⁰ = 43433497 is a prime.

It is a super-2 number, since 2×43434521² = 3773115228998882, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (43434421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25715 + ... + 27351.

It is an arithmetic number, because the mean of its divisors is an integer number (3946761).

Almost surely, 2^43434521 is an apocalyptic number.

It is an amenable number.

43434521 is a deficient number, since it is larger than the sum of its proper divisors (3926611).

43434521 is a wasteful number, since it uses less digits than its factorization.

43434521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1820 (or 1807 counting only the distinct ones).

The product of its digits is 5760, while the sum is 26.

The square root of 43434521 is about 6590.4871595353. The cubic root of 43434521 is about 351.5159307968.

Adding to 43434521 its reverse (12543434), we get a palindrome (55977955).

The spelling of 43434521 in words is "forty-three million, four hundred thirty-four thousand, five hundred twenty-one".