618865 has 8 divisors (see below), whose sum is σ = 799848. Its totient is φ = 456960.

The previous prime is 618859. The next prime is 618869. The reversal of 618865 is 568816.

It is a happy number.

618865 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 4 ways, for example, as 5776 + 613089 = 76^2 + 783^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 618865 - 2³ = 618857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 618865.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4696 + ... + 4825.

It is an arithmetic number, because the mean of its divisors is an integer number (99981).

2⁶¹⁸⁸⁶⁵ is an apocalyptic number.

618865 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

618865 is a deficient number, since it is larger than the sum of its proper divisors (180983).

618865 is a wasteful number, since it uses less digits than its factorization.

618865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9539.

The product of its digits is 11520, while the sum is 34.

The square root of 618865 is about 786.6797315299. The cubic root of 618865 is about 85.2181248956.

The spelling of 618865 in words is "six hundred eighteen thousand, eight hundred sixty-five".