43633421 has 4 divisors (see below), whose sum is σ = 46989852. Its totient is φ = 40276992.

The previous prime is 43633409. The next prime is 43633427. The reversal of 43633421 is 12433634.

It is a happy number.

43633421 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.

It can be written as a sum of positive squares in 2 ways, for example, as 6056521 + 37576900 = 2461^2 + 6130^2 .

It is a cyclic number.

It is not a de Polignac number, because 43633421 - 2⁶ = 43633357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43633427) by changing a digit.

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, 1678196 + ... + 1678221.

It is an arithmetic number, because the mean of its divisors is an integer number (11747463).

Almost surely, 2^43633421 is an apocalyptic number.

It is an amenable number.

43633421 is a deficient number, since it is larger than the sum of its proper divisors (3356431).

43633421 is a wasteful number, since it uses less digits than its factorization.

43633421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3356430.

The product of its digits is 5184, while the sum is 26.

The square root of 43633421 is about 6605.5598551523. The cubic root of 43633421 is about 352.0516802779.

The spelling of 43633421 in words is "forty-three million, six hundred thirty-three thousand, four hundred twenty-one".