12123870 has 32 divisors (see below), whose sum is σ = 31743360. Its totient is φ = 2939040.

The previous prime is 12123857. The next prime is 12123877. The reversal of 12123870 is 7832121.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 12123870.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12123877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18040 + ... + 18699.

It is an arithmetic number, because the mean of its divisors is an integer number (991980).

Almost surely, 2^12123870 is an apocalyptic number.

12123870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12123870 is an abundant number, since it is smaller than the sum of its proper divisors (19619490).

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

12123870 is a wasteful number, since it uses less digits than its factorization.

12123870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36760.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 12123870 is about 3481.9348069715. The cubic root of 12123870 is about 229.7279076024.

Adding to 12123870 its reverse (7832121), we get a palindrome (19955991).

The spelling of 12123870 in words is "twelve million, one hundred twenty-three thousand, eight hundred seventy".