613885 has 4 divisors (see below), whose sum is σ = 736668. Its totient is φ = 491104.

The previous prime is 613883. The next prime is 613889. The reversal of 613885 is 588316.

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 79524 + 534361 = 282^2 + 731^2 .

It is a cyclic number.

It is not a de Polignac number, because 613885 - 2¹ = 613883 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 a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (613883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61384 + ... + 61393.

It is an arithmetic number, because the mean of its divisors is an integer number (184167).

2⁶¹³⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

613885 is a deficient number, since it is larger than the sum of its proper divisors (122783).

613885 is a wasteful number, since it uses less digits than its factorization.

613885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122782.

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

The square root of 613885 is about 783.5081365244. The cubic root of 613885 is about 84.9889258929.

The spelling of 613885 in words is "six hundred thirteen thousand, eight hundred eighty-five".