388647 has 24 divisors (see below), whose sum is σ = 665600. Its totient is φ = 213840.

The previous prime is 388621. The next prime is 388651. The reversal of 388647 is 746883.

388647 is a `hidden beast` number, since 3 + 8 + 8 + 647 = 666.

It is not a de Polignac number, because 388647 - 2⁷ = 388519 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

388647 is a lucky number.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388657) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1854 + ... + 2052.

2³⁸⁸⁶⁴⁷ is an apocalyptic number.

388647 is a deficient number, since it is larger than the sum of its proper divisors (276953).

388647 is a wasteful number, since it uses less digits than its factorization.

388647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243 (or 240 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 388647 is about 623.4155917203. The cubic root of 388647 is about 72.9768488543.

Adding to 388647 its product of digits (32256), we get a triangular number (420903 = T₉₁₇).

It can be divided in two parts, 388 and 647, that added together give a triangular number (1035 = T₄₅).

The spelling of 388647 in words is "three hundred eighty-eight thousand, six hundred forty-seven".