381706 has 16 divisors (see below), whose sum is σ = 630504. Its totient is φ = 172224.

The previous prime is 381697. The next prime is 381707. The reversal of 381706 is 607183.

It can be written as a sum of positive squares in 4 ways, for example, as 241081 + 140625 = 491^2 + 375^2 .

It is not an unprimeable number, because it can be changed into a prime (381707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1240 + ... + 1516.

2³⁸¹⁷⁰⁶ is an apocalyptic number.

381706 is a deficient number, since it is larger than the sum of its proper divisors (248798).

381706 is a wasteful number, since it uses less digits than its factorization.

381706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 381706 is about 617.8235994198. The cubic root of 381706 is about 72.5397958291.

Adding to 381706 its reverse (607183), we get a palindrome (988889).

The spelling of 381706 in words is "three hundred eighty-one thousand, seven hundred six".