123431243 has 16 divisors (see below), whose sum is σ = 139491072. Its totient is φ = 108432000.

The previous prime is 123431233. The next prime is 123431251. The reversal of 123431243 is 342134321.

It is a cyclic number.

It is not a de Polignac number, because 123431243 - 2⁴ = 123431227 is a prime.

It is a Smith number, since the sum of its digits (23) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (123431233) 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, 22073 + ... + 27093.

It is an arithmetic number, because the mean of its divisors is an integer number (8718192).

Almost surely, 2^123431243 is an apocalyptic number.

123431243 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

123431243 is a deficient number, since it is larger than the sum of its proper divisors (16059829).

123431243 is a wasteful number, since it uses less digits than its factorization.

123431243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5126.

The product of its digits is 1728, while the sum is 23.

The square root of 123431243 is about 11109.9614310762. The cubic root of 123431243 is about 497.8995122591.

Adding to 123431243 its reverse (342134321), we get a palindrome (465565564).

The spelling of 123431243 in words is "one hundred twenty-three million, four hundred thirty-one thousand, two hundred forty-three".