123566 has 8 divisors (see below), whose sum is σ = 191424. Its totient is φ = 59760.

The previous prime is 123553. The next prime is 123581. The reversal of 123566 is 665321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 10.

It is a nialpdrome in base 13.

It is a congruent number.

It is an unprimeable number.

123566 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 935 + ... + 1058.

It is an arithmetic number, because the mean of its divisors is an integer number (23928).

2¹²³⁵⁶⁶ is an apocalyptic number.

123566 is a deficient number, since it is larger than the sum of its proper divisors (67858).

123566 is a wasteful number, since it uses less digits than its factorization.

It is an anagram of its base 8 representation: 123566 = (361256)₈.

123566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2026.

The product of its digits is 1080, while the sum is 23.

The square root of 123566 is about 351.5195584886. The cubic root of 123566 is about 49.8080641554.

Adding to 123566 its reverse (665321), we get a palindrome (788887).

The spelling of 123566 in words is "one hundred twenty-three thousand, five hundred sixty-six".