12123240 has 32 divisors (see below), whose sum is σ = 36370080. Its totient is φ = 3232832.

The previous prime is 12123239. The next prime is 12123253. The reversal of 12123240 is 4232121.

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 50394 + ... + 50633.

It is an arithmetic number, because the mean of its divisors is an integer number (1136565).

Almost surely, 2^12123240 is an apocalyptic number.

12123240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12123240 is an abundant number, since it is smaller than the sum of its proper divisors (24246840).

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

12123240 is a wasteful number, since it uses less digits than its factorization.

12123240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101041 (or 101037 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 12123240 is about 3481.8443388526. The cubic root of 12123240 is about 229.7239283700.

Adding to 12123240 its reverse (4232121), we get a palindrome (16355361).

The spelling of 12123240 in words is "twelve million, one hundred twenty-three thousand, two hundred forty".