12081428 has 6 divisors (see below), whose sum is σ = 21142506. Its totient is φ = 6040712.

The previous prime is 12081401. The next prime is 12081439. The reversal of 12081428 is 82418021.

It can be written as a sum of positive squares in only one way, i.e., 6615184 + 5466244 = 2572^2 + 2338^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12081397 and 12081406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1510175 + ... + 1510182.

It is an arithmetic number, because the mean of its divisors is an integer number (3523751).

Almost surely, 2^12081428 is an apocalyptic number.

It is an amenable number.

12081428 is a deficient number, since it is larger than the sum of its proper divisors (9061078).

12081428 is a wasteful number, since it uses less digits than its factorization.

12081428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3020361 (or 3020359 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 12081428 is about 3475.8348637414. The cubic root of 12081428 is about 229.4595248877.

Adding to 12081428 its reverse (82418021), we get a palindrome (94499449).

The spelling of 12081428 in words is "twelve million, eighty-one thousand, four hundred twenty-eight".