865535997 has 8 divisors (see below), whose sum is σ = 1162472256. Its totient is φ = 572811872.

The previous prime is 865535981. The next prime is 865535999. The reversal of 865535997 is 799535568.

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 865535997 - 2⁴ = 865535981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865535999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1052553 + ... + 1053374.

It is an arithmetic number, because the mean of its divisors is an integer number (145309032).

Almost surely, 2^865535997 is an apocalyptic number.

It is an amenable number.

865535997 is a deficient number, since it is larger than the sum of its proper divisors (296936259).

865535997 is a wasteful number, since it uses less digits than its factorization.

865535997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2106067.

The product of its digits is 10206000, while the sum is 57.

The square root of 865535997 is about 29419.9931509169. The cubic root of 865535997 is about 953.0047052080.

The spelling of 865535997 in words is "eight hundred sixty-five million, five hundred thirty-five thousand, nine hundred ninety-seven".