123205440320440 has 16 divisors (see below), whose sum is σ = 277212240721080. Its totient is φ = 49282176128160.

The previous prime is 123205440320401. The next prime is 123205440320467. The reversal of 123205440320440 is 44023044502321.

It is a junction number, because it is equal to n+sod(n) for n = 123205440320396 and 123205440320405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1540068003966 + ... + 1540068004045.

Almost surely, 2^{123205440320440} is an apocalyptic number.

123205440320440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123205440320440 is an abundant number, since it is smaller than the sum of its proper divisors (154006800400640).

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

123205440320440 is a wasteful number, since it uses less digits than its factorization.

123205440320440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3080136008022 (or 3080136008018 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 34.

Adding to 123205440320440 its reverse (44023044502321), we get a palindrome (167228484822761).

The spelling of 123205440320440 in words is "one hundred twenty-three trillion, two hundred five billion, four hundred forty million, three hundred twenty thousand, four hundred forty".