12129078 has 16 divisors (see below), whose sum is σ = 26124336. Its totient is φ = 3732000.

The previous prime is 12129067. The next prime is 12129079. The reversal of 12129078 is 87092121.

12129078 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×12129078² = 294229066260168, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12129079) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77673 + ... + 77828.

It is an arithmetic number, because the mean of its divisors is an integer number (1632771).

Almost surely, 2^12129078 is an apocalyptic number.

12129078 is an abundant number, since it is smaller than the sum of its proper divisors (13995258).

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

12129078 is a wasteful number, since it uses less digits than its factorization.

12129078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155519.

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

The square root of 12129078 is about 3482.6825867426. The cubic root of 12129078 is about 229.7607973114.

The spelling of 12129078 in words is "twelve million, one hundred twenty-nine thousand, seventy-eight".