123223520440 has 32 divisors (see below), whose sum is σ = 277263272160. Its totient is φ = 49287568000.

The previous prime is 123223520383. The next prime is 123223520467. The reversal of 123223520440 is 44025322321.

It is a junction number, because it is equal to n+sod(n) for n = 123223520399 and 123223520408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1662165 + ... + 1734715.

It is an arithmetic number, because the mean of its divisors is an integer number (8664477255).

Almost surely, 2^123223520440 is an apocalyptic number.

123223520440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123223520440 is an abundant number, since it is smaller than the sum of its proper divisors (154039751720).

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

123223520440 is a wasteful number, since it uses less digits than its factorization.

123223520440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115023 (or 115019 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

Adding to 123223520440 its reverse (44025322321), we get a palindrome (167248842761).

The spelling of 123223520440 in words is "one hundred twenty-three billion, two hundred twenty-three million, five hundred twenty thousand, four hundred forty".