123220123240 has 32 divisors (see below), whose sum is σ = 277256056680. Its totient is φ = 49286132992.

The previous prime is 123220123207. The next prime is 123220123241. The reversal of 123220123240 is 42321022321.

It can be written as a sum of positive squares in 4 ways, for example, as 118695408484 + 4524714756 = 344522^2 + 67266^2 .

It is not an unprimeable number, because it can be changed into a prime (123220123241) 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, 1454694 + ... + 1537066.

Almost surely, 2^123220123240 is an apocalyptic number.

123220123240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123220123240 is an abundant number, since it is smaller than the sum of its proper divisors (154035933440).

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

123220123240 is a wasteful number, since it uses less digits than its factorization.

123220123240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119781 (or 119777 counting only the distinct ones).

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

Adding to 123220123240 its reverse (42321022321), we get a palindrome (165541145561).

The spelling of 123220123240 in words is "one hundred twenty-three billion, two hundred twenty million, one hundred twenty-three thousand, two hundred forty".