12115428 has 48 divisors (see below), whose sum is σ = 31281600. Its totient is φ = 3625344.

The previous prime is 12115421. The next prime is 12115463. The reversal of 12115428 is 82451121.

It is a junction number, because it is equal to n+sod(n) for n = 12115398 and 12115407.

It is not an unprimeable number, because it can be changed into a prime (12115421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4723 + ... + 6821.

It is an arithmetic number, because the mean of its divisors is an integer number (651700).

Almost surely, 2^12115428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12115428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15640800).

12115428 is an abundant number, since it is smaller than the sum of its proper divisors (19166172).

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

12115428 is a wasteful number, since it uses less digits than its factorization.

12115428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2156 (or 2154 counting only the distinct ones).

The product of its digits is 640, while the sum is 24.

The square root of 12115428 is about 3480.7223388257. The cubic root of 12115428 is about 229.6745744311.

Adding to 12115428 its reverse (82451121), we get a palindrome (94566549).

It can be divided in two parts, 12 and 115428, that added together give a triangular number (115440 = T₄₈₀).

The spelling of 12115428 in words is "twelve million, one hundred fifteen thousand, four hundred twenty-eight".