361685 has 4 divisors (see below), whose sum is σ = 434028. Its totient is φ = 289344.

The previous prime is 361679. The next prime is 361687. The reversal of 361685 is 586163.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 586163 = 139 ⋅4217.

It can be written as a sum of positive squares in 2 ways, for example, as 117649 + 244036 = 343^2 + 494^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-361685 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 (361687) 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, 36164 + ... + 36173.

It is an arithmetic number, because the mean of its divisors is an integer number (108507).

2³⁶¹⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

361685 is a deficient number, since it is larger than the sum of its proper divisors (72343).

361685 is an equidigital number, since it uses as much as digits as its factorization.

361685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72342.

The product of its digits is 4320, while the sum is 29.

The square root of 361685 is about 601.4025274307. The cubic root of 361685 is about 71.2486816212.

The spelling of 361685 in words is "three hundred sixty-one thousand, six hundred eighty-five".