865529540 has 12 divisors (see below), whose sum is σ = 1817612076. Its totient is φ = 346211808.

The previous prime is 865529521. The next prime is 865529543. The reversal of 865529540 is 45925568.

It can be written as a sum of positive squares in 2 ways, for example, as 325153024 + 540376516 = 18032^2 + 23246^2 .

It is a super-2 number, since 2×865529540² = 1498282769225223200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 865529491 and 865529500.

It is not an unprimeable number, because it can be changed into a prime (865529543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21638219 + ... + 21638258.

It is an arithmetic number, because the mean of its divisors is an integer number (151467673).

Almost surely, 2^865529540 is an apocalyptic number.

It is an amenable number.

865529540 is an abundant number, since it is smaller than the sum of its proper divisors (952082536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

865529540 is a wasteful number, since it uses less digits than its factorization.

865529540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43276486 (or 43276484 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 44.

The square root of 865529540 is about 29419.8834124134. The cubic root of 865529540 is about 953.0023353598.

The spelling of 865529540 in words is "eight hundred sixty-five million, five hundred twenty-nine thousand, five hundred forty".