123135240 has 32 divisors (see below), whose sum is σ = 369406080. Its totient is φ = 32836032.

The previous prime is 123135179. The next prime is 123135251. The reversal of 123135240 is 42531321.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 512944 + ... + 513183.

It is an arithmetic number, because the mean of its divisors is an integer number (11543940).

Almost surely, 2^123135240 is an apocalyptic number.

123135240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123135240 is an abundant number, since it is smaller than the sum of its proper divisors (246270840).

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

123135240 is a wasteful number, since it uses less digits than its factorization.

123135240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1026141 (or 1026137 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 123135240 is about 11096.6319214436. The cubic root of 123135240 is about 497.5011859942.

Adding to 123135240 its reverse (42531321), we get a palindrome (165666561).

The spelling of 123135240 in words is "one hundred twenty-three million, one hundred thirty-five thousand, two hundred forty".