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23158 = 211579
BaseRepresentation
bin101101001110110
31011202201
411221312
51220113
6255114
7124342
oct55166
934681
1023158
1116443
121149a
13a705
148622
156cdd
hex5a76

23158 has 4 divisors (see below), whose sum is σ = 34740. Its totient is φ = 11578.

The previous prime is 23143. The next prime is 23159. The reversal of 23158 is 85132.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an Ulam number.

It is a plaindrome in base 12 and base 15.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5788 + ... + 5791.

It is an arithmetic number, because the mean of its divisors is an integer number (8685).

223158 is an apocalyptic number.

23158 is a deficient number, since it is larger than the sum of its proper divisors (11582).

23158 is a wasteful number, since it uses less digits than its factorization.

23158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11581.

The product of its digits is 240, while the sum is 19.

The square root of 23158 is about 152.1775279074. The cubic root of 23158 is about 28.5036416810.

It can be divided in two parts, 231 and 58, that added together give a square (289 = 172).

The spelling of 23158 in words is "twenty-three thousand, one hundred fifty-eight".

Divisors: 1 2 11579 23158