12399228 has 18 divisors (see below), whose sum is σ = 31342584. Its totient is φ = 4133064.

The previous prime is 12399199. The next prime is 12399251. The reversal of 12399228 is 82299321.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 344423 = 12399228 / (1 + 2 + 3 + 9 + 9 + 2 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 12399192 and 12399201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 172176 + ... + 172247.

Almost surely, 2^12399228 is an apocalyptic number.

12399228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

12399228 is an abundant number, since it is smaller than the sum of its proper divisors (18943356).

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

12399228 is a wasteful number, since it uses less digits than its factorization.

12399228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344433 (or 344428 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 12399228 is about 3521.2537539916. The cubic root of 12399228 is about 231.4541019584.

The spelling of 12399228 in words is "twelve million, three hundred ninety-nine thousand, two hundred twenty-eight".