381686 has 4 divisors (see below), whose sum is σ = 572532. Its totient is φ = 190842.

The previous prime is 381673. The next prime is 381697. The reversal of 381686 is 686183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 686183 = 487 ⋅1409.

It is a congruent number.

It is an unprimeable number.

381686 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, 95420 + ... + 95423.

It is an arithmetic number, because the mean of its divisors is an integer number (143133).

2³⁸¹⁶⁸⁶ is an apocalyptic number.

381686 is a deficient number, since it is larger than the sum of its proper divisors (190846).

381686 is a wasteful number, since it uses less digits than its factorization.

381686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190845.

The product of its digits is 6912, while the sum is 32.

The square root of 381686 is about 617.8074133579. The cubic root of 381686 is about 72.5385288669.

The spelling of 381686 in words is "three hundred eighty-one thousand, six hundred eighty-six".