865149 has 4 divisors (see below), whose sum is σ = 1153536. Its totient is φ = 576764.

The previous prime is 865121. The next prime is 865153. The reversal of 865149 is 941568.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 865149 - 2¹² = 861053 is a prime.

It is a D-number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144189 + ... + 144194.

It is an arithmetic number, because the mean of its divisors is an integer number (288384).

2⁸⁶⁵¹⁴⁹ is an apocalyptic number.

It is an amenable number.

865149 is a deficient number, since it is larger than the sum of its proper divisors (288387).

865149 is a wasteful number, since it uses less digits than its factorization.

865149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288386.

The product of its digits is 8640, while the sum is 33.

The square root of 865149 is about 930.1338613339. The cubic root of 865149 is about 95.2862648747.

The spelling of 865149 in words is "eight hundred sixty-five thousand, one hundred forty-nine".