43540361 has 4 divisors (see below), whose sum is σ = 43554000. Its totient is φ = 43526724.

The previous prime is 43540351. The next prime is 43540363. The reversal of 43540361 is 16304534.

43540361 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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16304534 = 2 ⋅8152267.

It is a cyclic number.

It is not a de Polignac number, because 43540361 - 2¹⁰ = 43539337 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43540361.

It is not an unprimeable number, because it can be changed into a prime (43540363) 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, 830 + ... + 9368.

It is an arithmetic number, because the mean of its divisors is an integer number (10888500).

Almost surely, 2^43540361 is an apocalyptic number.

It is an amenable number.

43540361 is a deficient number, since it is larger than the sum of its proper divisors (13639).

43540361 is an equidigital number, since it uses as much as digits as its factorization.

43540361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13638.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 43540361 is about 6598.5120292381. The cubic root of 43540361 is about 351.8012205197.

Adding to 43540361 its reverse (16304534), we get a palindrome (59844895).

The spelling of 43540361 in words is "forty-three million, five hundred forty thousand, three hundred sixty-one".