123205245 has 16 divisors (see below), whose sum is σ = 197629632. Its totient is φ = 65542400.

The previous prime is 123205223. The next prime is 123205249. The reversal of 123205245 is 542502321.

It is not a de Polignac number, because 123205245 - 2⁵ = 123205213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123205249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4227 + ... + 16256.

It is an arithmetic number, because the mean of its divisors is an integer number (12351852).

Almost surely, 2^123205245 is an apocalyptic number.

123205245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123205245 is a deficient number, since it is larger than the sum of its proper divisors (74424387).

123205245 is a wasteful number, since it uses less digits than its factorization.

123205245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20892.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 123205245 is about 11099.7858087442. The cubic root of 123205245 is about 497.5954481310.

Adding to 123205245 its reverse (542502321), we get a palindrome (665707566).

The spelling of 123205245 in words is "one hundred twenty-three million, two hundred five thousand, two hundred forty-five".