123404531544 has 96 divisors (see below), whose sum is σ = 385674981120. Its totient is φ = 34916107968.

The previous prime is 123404531521. The next prime is 123404531567. The reversal of 123404531544 is 445135404321.

123404531544 is a `hidden beast` number, since 1 + 2 + 3 + 40 + 45 + 31 + 544 = 666.

It is an interprime number because it is at equal distance from previous prime (123404531521) and next prime (123404531567).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 123404531499 and 123404531508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1136682 + ... + 1240505.

It is an arithmetic number, because the mean of its divisors is an integer number (4017447720).

Almost surely, 2^123404531544 is an apocalyptic number.

123404531544 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

123404531544 is an abundant number, since it is smaller than the sum of its proper divisors (262270449576).

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

123404531544 is a wasteful number, since it uses less digits than its factorization.

123404531544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2377309 (or 2377302 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

Adding to 123404531544 its reverse (445135404321), we get a palindrome (568539935865).

The spelling of 123404531544 in words is "one hundred twenty-three billion, four hundred four million, five hundred thirty-one thousand, five hundred forty-four".