43421237 has 4 divisors (see below), whose sum is σ = 43733760. Its totient is φ = 43108716.

The previous prime is 43421233. The next prime is 43421249. The reversal of 43421237 is 73212434.

43421237 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, 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 43421237 - 2² = 43421233 is a prime.

It is a super-2 number, since 2×43421237² = 3770807645220338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43421233) 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, 156053 + ... + 156330.

It is an arithmetic number, because the mean of its divisors is an integer number (10933440).

Almost surely, 2^43421237 is an apocalyptic number.

It is an amenable number.

43421237 is a deficient number, since it is larger than the sum of its proper divisors (312523).

43421237 is a wasteful number, since it uses less digits than its factorization.

43421237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312522.

The product of its digits is 4032, while the sum is 26.

The square root of 43421237 is about 6589.4792662243. The cubic root of 43421237 is about 351.4800913029.

The spelling of 43421237 in words is "forty-three million, four hundred twenty-one thousand, two hundred thirty-seven".