43421405 has 8 divisors (see below), whose sum is σ = 52141752. Its totient is φ = 34713088.

The previous prime is 43421393. The next prime is 43421429. The reversal of 43421405 is 50412434.

It can be written as a sum of positive squares in 4 ways, for example, as 11464996 + 31956409 = 3386^2 + 5653^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 43421405 - 2⁶ = 43421341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10289 + ... + 13881.

It is an arithmetic number, because the mean of its divisors is an integer number (6517719).

Almost surely, 2^43421405 is an apocalyptic number.

It is an amenable number.

43421405 is a deficient number, since it is larger than the sum of its proper divisors (8720347).

43421405 is a wasteful number, since it uses less digits than its factorization.

43421405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6015.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 43421405 is about 6589.4920138050. The cubic root of 43421405 is about 351.4805446032.

Adding to 43421405 its reverse (50412434), we get a palindrome (93833839).

The spelling of 43421405 in words is "forty-three million, four hundred twenty-one thousand, four hundred five".