43036421 has 4 divisors (see below), whose sum is σ = 44037312. Its totient is φ = 42035532.

The previous prime is 43036417. The next prime is 43036447. The reversal of 43036421 is 12463034.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 43036421 - 2² = 43036417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43036451) 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 3 ways as a sum of consecutive naturals, for example, 500381 + ... + 500466.

It is an arithmetic number, because the mean of its divisors is an integer number (11009328).

Almost surely, 2^43036421 is an apocalyptic number.

It is an amenable number.

43036421 is a deficient number, since it is larger than the sum of its proper divisors (1000891).

43036421 is a wasteful number, since it uses less digits than its factorization.

43036421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000890.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 43036421 is about 6560.2150117203. The cubic root of 43036421 is about 350.4386907307.

Adding to 43036421 its reverse (12463034), we get a palindrome (55499455).

The spelling of 43036421 in words is "forty-three million, thirty-six thousand, four hundred twenty-one".