123440431 has 2 divisors, whose sum is σ = 123440432. Its totient is φ = 123440430.

The previous prime is 123440413. The next prime is 123440437. The reversal of 123440431 is 134044321.

Together with previous prime (123440413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123440431 - 2²³ = 115051823 is a prime.

It is a super-2 number, since 2×123440431² = 30475080010931522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123440437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61720215 + 61720216.

It is an arithmetic number, because the mean of its divisors is an integer number (61720216).

Almost surely, 2^123440431 is an apocalyptic number.

123440431 is a deficient number, since it is larger than the sum of its proper divisors (1).

123440431 is an equidigital number, since it uses as much as digits as its factorization.

123440431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 123440431 is about 11110.3749261670. The cubic root of 123440431 is about 497.9118662010.

Adding to 123440431 its reverse (134044321), we get a palindrome (257484752).

It can be divided in two parts, 12 and 3440431, that added together give a palindrome (3440443).

The spelling of 123440431 in words is "one hundred twenty-three million, four hundred forty thousand, four hundred thirty-one".