12129870 has 32 divisors (see below), whose sum is σ = 29791872. Its totient is φ = 3159072.

The previous prime is 12129863. The next prime is 12129883. The reversal of 12129870 is 7892121.

12129870 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3412 + ... + 5991.

It is an arithmetic number, because the mean of its divisors is an integer number (930996).

Almost surely, 2^12129870 is an apocalyptic number.

12129870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12129870 is an abundant number, since it is smaller than the sum of its proper divisors (17662002).

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

12129870 is a wasteful number, since it uses less digits than its factorization.

12129870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9456.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 12129870 is about 3482.7962903391. The cubic root of 12129870 is about 229.7657981474.

The spelling of 12129870 in words is "twelve million, one hundred twenty-nine thousand, eight hundred seventy".