43528421 has 2 divisors, whose sum is σ = 43528422. Its totient is φ = 43528420.

The previous prime is 43528417. The next prime is 43528469. The reversal of 43528421 is 12482534.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30096196 + 13432225 = 5486^2 + 3665^2 .

It is a cyclic number.

It is not a de Polignac number, because 43528421 - 2² = 43528417 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43528481) 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 as a sum of consecutive naturals, namely, 21764210 + 21764211.

It is an arithmetic number, because the mean of its divisors is an integer number (21764211).

Almost surely, 2^43528421 is an apocalyptic number.

It is an amenable number.

43528421 is a deficient number, since it is larger than the sum of its proper divisors (1).

43528421 is an equidigital number, since it uses as much as digits as its factorization.

43528421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7680, while the sum is 29.

The square root of 43528421 is about 6597.6072177722. The cubic root of 43528421 is about 351.7690596273.

The spelling of 43528421 in words is "forty-three million, five hundred twenty-eight thousand, four hundred twenty-one".