123401040340 has 24 divisors (see below), whose sum is σ = 260457635592. Its totient is φ = 49109854080.

The previous prime is 123401040337. The next prime is 123401040349. The reversal of 123401040340 is 43040104321.

It can be written as a sum of positive squares in 4 ways, for example, as 88087865616 + 35313174724 = 296796^2 + 187918^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123401040349) 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, 15656091 + ... + 15663970.

It is an arithmetic number, because the mean of its divisors is an integer number (10852401483).

Almost surely, 2^123401040340 is an apocalyptic number.

123401040340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123401040340 is an abundant number, since it is smaller than the sum of its proper divisors (137056595252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123401040340 is a wasteful number, since it uses less digits than its factorization.

123401040340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31320267 (or 31320265 counting only the distinct ones).

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

Adding to 123401040340 its reverse (43040104321), we get a palindrome (166441144661).

The spelling of 123401040340 in words is "one hundred twenty-three billion, four hundred one million, forty thousand, three hundred forty".