123440231431 has 8 divisors (see below), whose sum is σ = 134674259328. Its totient is φ = 112208235000.

The previous prime is 123440231423. The next prime is 123440231483. The reversal of 123440231431 is 134132044321.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 123440231431 - 2³ = 123440231423 is a prime.

It is a super-2 number, since 2×123440231431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123440231431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123440238431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 379395 + ... + 625156.

It is an arithmetic number, because the mean of its divisors is an integer number (16834282416).

Almost surely, 2^123440231431 is an apocalyptic number.

123440231431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

123440231431 is a deficient number, since it is larger than the sum of its proper divisors (11234027897).

123440231431 is a wasteful number, since it uses less digits than its factorization.

123440231431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015733.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 123440231431 its reverse (134132044321), we get a palindrome (257572275752).

The spelling of 123440231431 in words is "one hundred twenty-three billion, four hundred forty million, two hundred thirty-one thousand, four hundred thirty-one".