123234340240 has 80 divisors (see below), whose sum is σ = 312643846656. Its totient is φ = 44801484800.

The previous prime is 123234340213. The next prime is 123234340249. The reversal of 123234340240 is 42043432321.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×123234340240² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123234340199 and 123234340208.

It is not an unprimeable number, because it can be changed into a prime (123234340249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4139649 + ... + 4169311.

Almost surely, 2^123234340240 is an apocalyptic number.

123234340240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123234340240 is an abundant number, since it is smaller than the sum of its proper divisors (189409506416).

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

123234340240 is a wasteful number, since it uses less digits than its factorization.

123234340240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34408 (or 34402 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 123234340240 its reverse (42043432321), we get a palindrome (165277772561).

The spelling of 123234340240 in words is "one hundred twenty-three billion, two hundred thirty-four million, three hundred forty thousand, two hundred forty".