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389081 = 71131163
BaseRepresentation
bin1011110111111011001
3201202201102
41132333121
544422311
612201145
73210230
oct1367731
9652642
10389081
11246360
121691b5
13108134
14a1b17
157a43b
hex5efd9

389081 has 16 divisors (see below), whose sum is σ = 503808. Its totient is φ = 291600.

The previous prime is 389057. The next prime is 389083. The reversal of 389081 is 180983.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 389081 - 210 = 388057 is a prime.

It is a super-2 number, since 2×3890812 = 302768049122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (389083) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2306 + ... + 2468.

It is an arithmetic number, because the mean of its divisors is an integer number (31488).

2389081 is an apocalyptic number.

389081 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

389081 is a deficient number, since it is larger than the sum of its proper divisors (114727).

389081 is a wasteful number, since it uses less digits than its factorization.

389081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 389081 is about 623.7635770065. The cubic root of 389081 is about 73.0040030331.

It can be divided in two parts, 38 and 9081, that added together give a palindrome (9119).

The spelling of 389081 in words is "three hundred eighty-nine thousand, eighty-one".

Divisors: 1 7 11 31 77 163 217 341 1141 1793 2387 5053 12551 35371 55583 389081