387643 has 4 divisors (see below), whose sum is σ = 401040. Its totient is φ = 374248.

The previous prime is 387641. The next prime is 387659. The reversal of 387643 is 346783.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346783 = 17 ⋅20399.

It is a cyclic number.

It is not a de Polignac number, because 387643 - 2¹ = 387641 is a prime.

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 a d-powerful number, because it can be written as 3¹⁰ + 8⁵ + 6 + 7⁶ + 4⁵ + 3¹¹ .

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (387641) 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, 6655 + ... + 6712.

It is an arithmetic number, because the mean of its divisors is an integer number (100260).

2³⁸⁷⁶⁴³ is an apocalyptic number.

387643 is a deficient number, since it is larger than the sum of its proper divisors (13397).

387643 is a wasteful number, since it uses less digits than its factorization.

387643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13396.

The product of its digits is 12096, while the sum is 31.

The square root of 387643 is about 622.6098296686. The cubic root of 387643 is about 72.9139537857.

The spelling of 387643 in words is "three hundred eighty-seven thousand, six hundred forty-three".