123243240 has 32 divisors (see below), whose sum is σ = 369730080. Its totient is φ = 32864832.

The previous prime is 123243233. The next prime is 123243247. The reversal of 123243240 is 42342321.

It is an interprime number because it is at equal distance from previous prime (123243233) and next prime (123243247).

It is not an unprimeable number, because it can be changed into a prime (123243247) by changing a digit.

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, 513394 + ... + 513633.

It is an arithmetic number, because the mean of its divisors is an integer number (11554065).

Almost surely, 2^123243240 is an apocalyptic number.

123243240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123243240 is an abundant number, since it is smaller than the sum of its proper divisors (246486840).

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

123243240 is a wasteful number, since it uses less digits than its factorization.

123243240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1027041 (or 1027037 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 123243240 is about 11101.4971963245. The cubic root of 123243240 is about 497.6465936698.

Adding to 123243240 its reverse (42342321), we get a palindrome (165585561).

The spelling of 123243240 in words is "one hundred twenty-three million, two hundred forty-three thousand, two hundred forty".