123206 has 4 divisors (see below), whose sum is σ = 184812. Its totient is φ = 61602.

The previous prime is 123203. The next prime is 123209. The reversal of 123206 is 602321.

123206 = 174² + 175² + ... + 177².

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

It is an interprime number because it is at equal distance from previous prime (123203) and next prime (123209).

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30800 + ... + 30803.

It is an arithmetic number, because the mean of its divisors is an integer number (46203).

2¹²³²⁰⁶ is an apocalyptic number.

123206 is a deficient number, since it is larger than the sum of its proper divisors (61606).

123206 is an equidigital number, since it uses as much as digits as its factorization.

123206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61605.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 123206 is about 351.0071224349. The cubic root of 123206 is about 49.7596464548.

Adding to 123206 its reverse (602321), we get a palindrome (725527).

It can be divided in two parts, 12320 and 6, that multiplied together give a triangular number (73920 = T₃₈₄).

The spelling of 123206 in words is "one hundred twenty-three thousand, two hundred six".