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23139 = 33857
BaseRepresentation
bin101101001100011
31011202000
411221203
51220024
6255043
7124314
oct55143
934660
1023139
1116426
1211483
13a6bc
14860b
156cc9
hex5a63

23139 has 8 divisors (see below), whose sum is σ = 34320. Its totient is φ = 15408.

The previous prime is 23131. The next prime is 23143. The reversal of 23139 is 93132.

It is not a de Polignac number, because 23139 - 23 = 23131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 402 + ... + 455.

It is an arithmetic number, because the mean of its divisors is an integer number (4290).

223139 is an apocalyptic number.

23139 is a deficient number, since it is larger than the sum of its proper divisors (11181).

23139 is an equidigital number, since it uses as much as digits as its factorization.

23139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866 (or 860 counting only the distinct ones).

The product of its digits is 162, while the sum is 18.

The square root of 23139 is about 152.1150880090. The cubic root of 23139 is about 28.4958442694.

It can be divided in two parts, 231 and 39, that multiplied together give a palindrome (9009).

The spelling of 23139 in words is "twenty-three thousand, one hundred thirty-nine".

Divisors: 1 3 9 27 857 2571 7713 23139