402685 has 4 divisors (see below), whose sum is σ = 483228. Its totient is φ = 322144.

The previous prime is 402631. The next prime is 402691. The reversal of 402685 is 586204.

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 161604 + 241081 = 402^2 + 491^2 .

It is a cyclic number.

It is not a de Polignac number, because 402685 - 2¹⁵ = 369917 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent 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, 40264 + ... + 40273.

It is an arithmetic number, because the mean of its divisors is an integer number (120807).

2⁴⁰²⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

402685 is a deficient number, since it is larger than the sum of its proper divisors (80543).

402685 is an equidigital number, since it uses as much as digits as its factorization.

402685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80542.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 402685 is about 634.5746606980. The cubic root of 402685 is about 73.8451228767.

Adding to 402685 its reverse (586204), we get a palindrome (988889).

The spelling of 402685 in words is "four hundred two thousand, six hundred eighty-five".