612865 has 12 divisors (see below), whose sum is σ = 809172. Its totient is φ = 445280.

The previous prime is 612853. The next prime is 612869. The reversal of 612865 is 568216.

It can be written as a sum of positive squares in 2 ways, for example, as 69696 + 543169 = 264^2 + 737^2 .

It is not a de Polignac number, because 612865 - 2⁷ = 612737 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99 + ... + 1111.

It is an arithmetic number, because the mean of its divisors is an integer number (67431).

2⁶¹²⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

612865 is a deficient number, since it is larger than the sum of its proper divisors (196307).

612865 is a wasteful number, since it uses less digits than its factorization.

612865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040 (or 1029 counting only the distinct ones).

The product of its digits is 2880, while the sum is 28.

The square root of 612865 is about 782.8569473410. The cubic root of 612865 is about 84.9418287106.

It can be divided in two parts, 61 and 2865, that added together give a triangular number (2926 = T₇₆).

The spelling of 612865 in words is "six hundred twelve thousand, eight hundred sixty-five".