431686 has 4 divisors (see below), whose sum is σ = 647532. Its totient is φ = 215842.

The previous prime is 431671. The next prime is 431693. The reversal of 431686 is 686134.

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

It is a plaindrome in base 12.

It is a congruent number.

It is an unprimeable number.

431686 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107920 + ... + 107923.

It is an arithmetic number, because the mean of its divisors is an integer number (161883).

2⁴³¹⁶⁸⁶ is an apocalyptic number.

431686 is a deficient number, since it is larger than the sum of its proper divisors (215846).

431686 is a wasteful number, since it uses less digits than its factorization.

431686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215845.

The product of its digits is 3456, while the sum is 28.

The square root of 431686 is about 657.0281576919. The cubic root of 431686 is about 75.5769430354.

The spelling of 431686 in words is "four hundred thirty-one thousand, six hundred eighty-six".