383666 has 4 divisors (see below), whose sum is σ = 575502. Its totient is φ = 191832.

The previous prime is 383659. The next prime is 383681. The reversal of 383666 is 666383.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 666383 = 17 ⋅39199.

It can be written as a sum of positive squares in only one way, i.e., 271441 + 112225 = 521^2 + 335^2 .

It is an Ulam number.

It is an unprimeable number.

383666 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 as a sum of consecutive naturals, namely, 95915 + ... + 95918.

2³⁸³⁶⁶⁶ is an apocalyptic number.

383666 is a deficient number, since it is larger than the sum of its proper divisors (191836).

383666 is a wasteful number, since it uses less digits than its factorization.

383666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191835.

The product of its digits is 15552, while the sum is 32.

The square root of 383666 is about 619.4077816754. The cubic root of 383666 is about 72.6637440491.

The spelling of 383666 in words is "three hundred eighty-three thousand, six hundred sixty-six".