431666 has 4 divisors (see below), whose sum is σ = 647502. Its totient is φ = 215832.

The previous prime is 431663. The next prime is 431671. The reversal of 431666 is 666134.

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

It can be written as a sum of positive squares in only one way, i.e., 326041 + 105625 = 571^2 + 325^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 431666.

It is not an unprimeable number, because it can be changed into a prime (431663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107915 + ... + 107918.

2⁴³¹⁶⁶⁶ is an apocalyptic number.

431666 is a deficient number, since it is larger than the sum of its proper divisors (215836).

431666 is a wasteful number, since it uses less digits than its factorization.

431666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215835.

The product of its digits is 2592, while the sum is 26.

The square root of 431666 is about 657.0129374677. The cubic root of 431666 is about 75.5757758582.

The spelling of 431666 in words is "four hundred thirty-one thousand, six hundred sixty-six".