123123312240 has 40 divisors (see below), whose sum is σ = 381682268688. Its totient is φ = 32832883200.

The previous prime is 123123312223. The next prime is 123123312287. The reversal of 123123312240 is 42213321321.

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

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 123123312240.

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, 256506661 + ... + 256507140.

Almost surely, 2^123123312240 is an apocalyptic number.

123123312240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123123312240 is an abundant number, since it is smaller than the sum of its proper divisors (258558956448).

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

123123312240 is a wasteful number, since it uses less digits than its factorization.

123123312240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513013817 (or 513013811 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 123123312240 its reverse (42213321321), we get a palindrome (165336633561).

The spelling of 123123312240 in words is "one hundred twenty-three billion, one hundred twenty-three million, three hundred twelve thousand, two hundred forty".