123420023203240 has 64 divisors (see below), whose sum is σ = 284035495516560. Its totient is φ = 48248068177920.

The previous prime is 123420023203229. The next prime is 123420023203241. The reversal of 123420023203240 is 42302320024321.

It can be written as a sum of positive squares in 8 ways, for example, as 72207880140484 + 51212143062756 = 8497522^2 + 7156266^2 .

It is a junction number, because it is equal to n+sod(n) for n = 123420023203199 and 123420023203208.

It is not an unprimeable number, because it can be changed into a prime (123420023203241) 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, 112717791 + ... + 113807470.

Almost surely, 2^{123420023203240} is an apocalyptic number.

123420023203240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123420023203240 is an abundant number, since it is smaller than the sum of its proper divisors (160615472313320).

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

123420023203240 is a wasteful number, since it uses less digits than its factorization.

123420023203240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226525582 (or 226525578 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 123420023203240 its reverse (42302320024321), we get a palindrome (165722343227561).

The spelling of 123420023203240 in words is "one hundred twenty-three trillion, four hundred twenty billion, twenty-three million, two hundred three thousand, two hundred forty".