12939228 has 36 divisors (see below), whose sum is σ = 34430760. Its totient is φ = 4085856.

The previous prime is 12939217. The next prime is 12939257. The reversal of 12939228 is 82293921.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 12939192 and 12939201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8775 + ... + 10142.

It is an arithmetic number, because the mean of its divisors is an integer number (956410).

Almost surely, 2^12939228 is an apocalyptic number.

12939228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

12939228 is an abundant number, since it is smaller than the sum of its proper divisors (21491532).

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

12939228 is a wasteful number, since it uses less digits than its factorization.

12939228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18946 (or 18941 counting only the distinct ones).

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

The square root of 12939228 is about 3597.1138430692. The cubic root of 12939228 is about 234.7664981073.

The spelling of 12939228 in words is "twelve million, nine hundred thirty-nine thousand, two hundred twenty-eight".