43401321 has 6 divisors (see below), whose sum is σ = 62690810. Its totient is φ = 28934208.

The previous prime is 43401307. The next prime is 43401341. The reversal of 43401321 is 12310434.

43401321 is a `hidden beast` number, since 4 + 340 + 1 + 321 = 666.

It can be written as a sum of positive squares in only one way, i.e., 23474025 + 19927296 = 4845^2 + 4464^2 .

It is not a de Polignac number, because 43401321 - 2¹¹ = 43399273 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 43401294 and 43401303.

It is not an unprimeable number, because it can be changed into a prime (43401341) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2411176 + ... + 2411193.

Almost surely, 2^43401321 is an apocalyptic number.

It is an amenable number.

43401321 is a deficient number, since it is larger than the sum of its proper divisors (19289489).

43401321 is a wasteful number, since it uses less digits than its factorization.

43401321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4822375 (or 4822372 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 43401321 is about 6587.9678960966. The cubic root of 43401321 is about 351.4263453444.

Adding to 43401321 its reverse (12310434), we get a palindrome (55711755).

The spelling of 43401321 in words is "forty-three million, four hundred one thousand, three hundred twenty-one".