123543121440 has 96 divisors (see below), whose sum is σ = 393533562240. Its totient is φ = 32574654464.

The previous prime is 123543121439. The next prime is 123543121459. The reversal of 123543121440 is 44121345321.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 123543121398 and 123543121407.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1403244 + ... + 1488683.

It is an arithmetic number, because the mean of its divisors is an integer number (4099307940).

Almost surely, 2^123543121440 is an apocalyptic number.

123543121440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123543121440 is an abundant number, since it is smaller than the sum of its proper divisors (269990440800).

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

123543121440 is a wasteful number, since it uses less digits than its factorization.

123543121440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2892034 (or 2892026 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 123543121440 its reverse (44121345321), we get a palindrome (167664466761).

The spelling of 123543121440 in words is "one hundred twenty-three billion, five hundred forty-three million, one hundred twenty-one thousand, four hundred forty".