123240540 has 24 divisors (see below), whose sum is σ = 345073680. Its totient is φ = 32864128.

The previous prime is 123240539. The next prime is 123240569. The reversal of 123240540 is 45042321.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1026945 + ... + 1027064.

It is an arithmetic number, because the mean of its divisors is an integer number (14378070).

Almost surely, 2^123240540 is an apocalyptic number.

123240540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123240540 is an abundant number, since it is smaller than the sum of its proper divisors (221833140).

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

123240540 is a wasteful number, since it uses less digits than its factorization.

123240540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2054021 (or 2054019 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 123240540 is about 11101.3755904392. The cubic root of 123240540 is about 497.6429595134.

Adding to 123240540 its reverse (45042321), we get a palindrome (168282861).

The spelling of 123240540 in words is "one hundred twenty-three million, two hundred forty thousand, five hundred forty".