319666 has 4 divisors (see below), whose sum is σ = 479502. Its totient is φ = 159832.

The previous prime is 319639. The next prime is 319673. The reversal of 319666 is 666913.

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., 319225 + 441 = 565^2 + 21^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79915 + ... + 79918.

2³¹⁹⁶⁶⁶ is an apocalyptic number.

319666 is a deficient number, since it is larger than the sum of its proper divisors (159836).

319666 is a wasteful number, since it uses less digits than its factorization.

319666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159835.

The product of its digits is 5832, while the sum is 31.

The square root of 319666 is about 565.3901307947. The cubic root of 319666 is about 68.3752324176.

The spelling of 319666 in words is "three hundred nineteen thousand, six hundred sixty-six".