865642436 has 6 divisors (see below), whose sum is σ = 1514874270. Its totient is φ = 432821216.

The previous prime is 865642411. The next prime is 865642439. The reversal of 865642436 is 634246568.

865642436 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 862009600 + 3632836 = 29360^2 + 1906^2 .

It is a super-3 number, since 3×865642436³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (865642439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108205301 + ... + 108205308.

It is an arithmetic number, because the mean of its divisors is an integer number (252479045).

Almost surely, 2^865642436 is an apocalyptic number.

It is an amenable number.

865642436 is a deficient number, since it is larger than the sum of its proper divisors (649231834).

865642436 is a wasteful number, since it uses less digits than its factorization.

865642436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216410613 (or 216410611 counting only the distinct ones).

The product of its digits is 829440, while the sum is 44.

The square root of 865642436 is about 29421.8020522197. The cubic root of 865642436 is about 953.0437687518.

The spelling of 865642436 in words is "eight hundred sixty-five million, six hundred forty-two thousand, four hundred thirty-six".