43421893 has 8 divisors (see below), whose sum is σ = 46844568. Its totient is φ = 40095744.

The previous prime is 43421881. The next prime is 43421909. The reversal of 43421893 is 39812434.

It can be written as a sum of positive squares in 4 ways, for example, as 21687649 + 21734244 = 4657^2 + 4662^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43421893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43421803) 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 7 ways as a sum of consecutive naturals, for example, 23196 + ... + 24997.

It is an arithmetic number, because the mean of its divisors is an integer number (5855571).

Almost surely, 2^43421893 is an apocalyptic number.

It is an amenable number.

43421893 is a deficient number, since it is larger than the sum of its proper divisors (3422675).

43421893 is a wasteful number, since it uses less digits than its factorization.

43421893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48263.

The product of its digits is 20736, while the sum is 34.

The square root of 43421893 is about 6589.5290423520. The cubic root of 43421893 is about 351.4818613260.

The spelling of 43421893 in words is "forty-three million, four hundred twenty-one thousand, eight hundred ninety-three".