123540540 has 24 divisors (see below), whose sum is σ = 345913680. Its totient is φ = 32944128.

The previous prime is 123540539. The next prime is 123540541. The reversal of 123540540 is 45045321.

It is an interprime number because it is at equal distance from previous prime (123540539) and next prime (123540541).

It is a self number, because there is not a number n which added to its sum of digits gives 123540540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123540541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1029445 + ... + 1029564.

It is an arithmetic number, because the mean of its divisors is an integer number (14413070).

Almost surely, 2^123540540 is an apocalyptic number.

123540540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123540540 is an abundant number, since it is smaller than the sum of its proper divisors (222373140).

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

123540540 is a wasteful number, since it uses less digits than its factorization.

123540540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2059021 (or 2059019 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 123540540 is about 11114.8792166177. The cubic root of 123540540 is about 498.0464304059.

Adding to 123540540 its reverse (45045321), we get a palindrome (168585861).

The spelling of 123540540 in words is "one hundred twenty-three million, five hundred forty thousand, five hundred forty".