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39869 is a prime number
BaseRepresentation
bin1001101110111101
32000200122
421232331
52233434
6504325
7224144
oct115675
960618
1039869
1127a55
121b0a5
13151bb
141075b
15bc2e
hex9bbd

39869 has 2 divisors, whose sum is σ = 39870. Its totient is φ = 39868.

The previous prime is 39863. The next prime is 39877. The reversal of 39869 is 96893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34969 + 4900 = 187^2 + 70^2 .

It is an emirp because it is prime and its reverse (96893) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-39869 is a prime.

It is a super-2 number, since 2×398692 = 3179074322, which contains 22 as substring.

It is a Chen prime.

It is a d-powerful number, because it can be written as 35 + 92 + 85 + 63 + 94 .

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19934 + 19935.

It is an arithmetic number, because the mean of its divisors is an integer number (19935).

239869 is an apocalyptic number.

It is an amenable number.

39869 is a deficient number, since it is larger than the sum of its proper divisors (1).

39869 is an equidigital number, since it uses as much as digits as its factorization.

39869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 35.

The square root of 39869 is about 199.6722314194. The cubic root of 39869 is about 34.1621436276.

The spelling of 39869 in words is "thirty-nine thousand, eight hundred sixty-nine".