865491142 has 4 divisors (see below), whose sum is σ = 1298236716. Its totient is φ = 432745570.

The previous prime is 865491089. The next prime is 865491149. The reversal of 865491142 is 241194568.

865491142 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.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 865491095 and 865491104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865491149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 216372784 + ... + 216372787.

It is an arithmetic number, because the mean of its divisors is an integer number (324559179).

Almost surely, 2^865491142 is an apocalyptic number.

865491142 is a deficient number, since it is larger than the sum of its proper divisors (432745574).

865491142 is a wasteful number, since it uses less digits than its factorization.

865491142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432745573.

The product of its digits is 69120, while the sum is 40.

The square root of 865491142 is about 29419.2308193127. The cubic root of 865491142 is about 952.9882422823.

The spelling of 865491142 in words is "eight hundred sixty-five million, four hundred ninety-one thousand, one hundred forty-two".