12000078 has 12 divisors (see below), whose sum is σ = 26000208. Its totient is φ = 4000020.

The previous prime is 12000073. The next prime is 12000091. The reversal of 12000078 is 87000021.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 666671 = 12000078 / (1 + 2 + 0 + 0 + 0 + 0 + 7 + 8).

12000078 is a modest number, since divided by 78 gives 12 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 12000078.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12000073) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 333318 + ... + 333353.

It is an arithmetic number, because the mean of its divisors is an integer number (2166684).

Almost surely, 2^12000078 is an apocalyptic number.

12000078 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12000078 is an abundant number, since it is smaller than the sum of its proper divisors (14000130).

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

12000078 is a wasteful number, since it uses less digits than its factorization.

12000078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666679 (or 666676 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 12000078 is about 3464.1128734497. The cubic root of 12000078 is about 228.9433445524.

Adding to 12000078 its reverse (87000021), we get a palindrome (99000099).

The spelling of 12000078 in words is "twelve million, seventy-eight", and thus it is an aban number and an uban number.