402686 has 8 divisors (see below), whose sum is σ = 635880. Its totient is φ = 190728.

The previous prime is 402631. The next prime is 402691. The reversal of 402686 is 686204.

402686 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a plaindrome in base 13.

It is a congruent number.

It is an unprimeable number.

402686 is an untouchable number, because it is not equal to the sum of proper divisors of any 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, 5261 + ... + 5336.

It is an arithmetic number, because the mean of its divisors is an integer number (79485).

2⁴⁰²⁶⁸⁶ is an apocalyptic number.

402686 is a deficient number, since it is larger than the sum of its proper divisors (233194).

402686 is a wasteful number, since it uses less digits than its factorization.

402686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10618.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 402686 is about 634.5754486269. The cubic root of 402686 is about 73.8451840039.

The spelling of 402686 in words is "four hundred two thousand, six hundred eighty-six".