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388887 = 3129629
BaseRepresentation
bin1011110111100010111
3201202110020
41132330113
544421022
612200223
73206532
oct1367427
9652406
10388887
112461a4
12169073
13108015
14a1a19
157a35c
hex5ef17

388887 has 4 divisors (see below), whose sum is σ = 518520. Its totient is φ = 259256.

The previous prime is 388879. The next prime is 388891. The reversal of 388887 is 788883.

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 388887 - 23 = 388879 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64812 + ... + 64817.

It is an arithmetic number, because the mean of its divisors is an integer number (129630).

2388887 is an apocalyptic number.

388887 is a deficient number, since it is larger than the sum of its proper divisors (129633).

388887 is a wasteful number, since it uses less digits than its factorization.

388887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129632.

The product of its digits is 86016, while the sum is 42.

The square root of 388887 is about 623.6080499801. The cubic root of 388887 is about 72.9918674871.

It can be divided in two parts, 388 and 887, that added together give a triangular number (1275 = T50).

The spelling of 388887 in words is "three hundred eighty-eight thousand, eight hundred eighty-seven".

Divisors: 1 3 129629 388887