865540421 has 8 divisors (see below), whose sum is σ = 932284320. Its totient is φ = 800915472.

The previous prime is 865540411. The next prime is 865540427. The reversal of 865540421 is 124045568.

865540421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 865540421 - 2¹⁸ = 865278277 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 (865540427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 528890 + ... + 530523.

It is an arithmetic number, because the mean of its divisors is an integer number (116535540).

Almost surely, 2^865540421 is an apocalyptic number.

It is an amenable number.

865540421 is a deficient number, since it is larger than the sum of its proper divisors (66743899).

865540421 is a wasteful number, since it uses less digits than its factorization.

865540421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1059475.

The product of its (nonzero) digits is 38400, while the sum is 35.

The square root of 865540421 is about 29420.0683377860. The cubic root of 865540421 is about 953.0063288977.

Adding to 865540421 its reverse (124045568), we get a palindrome (989585989).

The spelling of 865540421 in words is "eight hundred sixty-five million, five hundred forty thousand, four hundred twenty-one".