123243504431440 has 40 divisors (see below), whose sum is σ = 286554673577088. Its totient is φ = 49295074757760.

The previous prime is 123243504431417. The next prime is 123243504431477. The reversal of 123243504431440 is 44134405342321.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×123243504431440² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 123243504431393 and 123243504431402.

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, 34653732 + ... + 38044291.

Almost surely, 2^{123243504431440} is an apocalyptic number.

123243504431440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123243504431440 is an abundant number, since it is smaller than the sum of its proper divisors (163311169145648).

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

123243504431440 is a wasteful number, since it uses less digits than its factorization.

123243504431440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72719227 (or 72719221 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 40.

Adding to 123243504431440 its reverse (44134405342321), we get a palindrome (167377909773761).

The spelling of 123243504431440 in words is "one hundred twenty-three trillion, two hundred forty-three billion, five hundred four million, four hundred thirty-one thousand, four hundred forty".