618385 has 4 divisors (see below), whose sum is σ = 742068. Its totient is φ = 494704.

The previous prime is 618377. The next prime is 618407. The reversal of 618385 is 583816.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 355216 + 263169 = 596^2 + 513^2 .

It is a cyclic number.

It is not a de Polignac number, because 618385 - 2³ = 618377 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61834 + ... + 61843.

It is an arithmetic number, because the mean of its divisors is an integer number (185517).

2⁶¹⁸³⁸⁵ is an apocalyptic number.

It is an amenable number.

618385 is a deficient number, since it is larger than the sum of its proper divisors (123683).

618385 is a wasteful number, since it uses less digits than its factorization.

618385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123682.

The product of its digits is 5760, while the sum is 31.

The square root of 618385 is about 786.3745926720. The cubic root of 618385 is about 85.1960870899.

The spelling of 618385 in words is "six hundred eighteen thousand, three hundred eighty-five".