• 387 can be written using four 4's:
387 has 6 divisors (see below), whose sum is σ = 572. Its totient is φ = 252.
The previous prime is 383. The next prime is 389. The reversal of 387 is 783.
387 is nontrivially palindromic in base 2.
It is not a de Polignac number, because 387 - 22 = 383 is a prime.
It is an alternating number because its digits alternate between odd and even.
It is a Duffinian number.
It is a plaindrome in base 13 and base 15.
It is a nialpdrome in base 11.
It is a zygodrome in base 2.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 387.
It is not an unprimeable number, because it can be changed into a prime (383) by changing a digit.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13 + ... + 30.
387 is a deficient number, since it is larger than the sum of its proper divisors (185).
387 is a wasteful number, since it uses less digits than its factorization.
387 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 49 (or 46 counting only the distinct ones).
The product of its digits is 168, while the sum is 18.
The square root of 387 is about 19.6723155729. The cubic root of 387 is about 7.2873616311.
Adding to 387 its product of digits (168), we get a palindrome (555).
It can be divided in two parts, 38 and 7, that added together give a triangular number (45 = T9).
The spelling of 387 in words is "three hundred eighty-seven", and thus it is an aban number and an oban number.
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