381647 has 4 divisors (see below), whose sum is σ = 436176. Its totient is φ = 327120.

The previous prime is 381637. The next prime is 381659. The reversal of 381647 is 746183.

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

It is a cyclic number.

It is not a de Polignac number, because 381647 - 2⁴ = 381631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27254 + ... + 27267.

It is an arithmetic number, because the mean of its divisors is an integer number (109044).

2³⁸¹⁶⁴⁷ is an apocalyptic number.

381647 is a deficient number, since it is larger than the sum of its proper divisors (54529).

381647 is an equidigital number, since it uses as much as digits as its factorization.

381647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54528.

The product of its digits is 4032, while the sum is 29.

The square root of 381647 is about 617.7758493175. The cubic root of 381647 is about 72.5360581632.

The spelling of 381647 in words is "three hundred eighty-one thousand, six hundred forty-seven".