123440231 has 4 divisors (see below), whose sum is σ = 123748464. Its totient is φ = 123132000.

The previous prime is 123440227. The next prime is 123440257. The reversal of 123440231 is 132044321.

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

It is a cyclic number.

It is not a de Polignac number, because 123440231 - 2² = 123440227 is a prime.

It is a super-2 number, since 2×123440231² = 30474981258666722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123440431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153515 + ... + 154316.

It is an arithmetic number, because the mean of its divisors is an integer number (30937116).

Almost surely, 2^123440231 is an apocalyptic number.

123440231 is a deficient number, since it is larger than the sum of its proper divisors (308233).

123440231 is an equidigital number, since it uses as much as digits as its factorization.

123440231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308232.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 123440231 is about 11110.3659255670. The cubic root of 123440231 is about 497.9115972928.

Adding to 123440231 its reverse (132044321), we get a palindrome (255484552).

The spelling of 123440231 in words is "one hundred twenty-three million, four hundred forty thousand, two hundred thirty-one".