16381228 has 12 divisors (see below), whose sum is σ = 28795032. Its totient is φ = 8154080.

The previous prime is 16381207. The next prime is 16381231. The reversal of 16381228 is 82218361.

It is a self number, because there is not a number n which added to its sum of digits gives 16381228.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8113 + ... + 9928.

It is an arithmetic number, because the mean of its divisors is an integer number (2399586).

Almost surely, 2^16381228 is an apocalyptic number.

It is an amenable number.

16381228 is a deficient number, since it is larger than the sum of its proper divisors (12413804).

16381228 is a wasteful number, since it uses less digits than its factorization.

16381228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18272 (or 18270 counting only the distinct ones).

The product of its digits is 4608, while the sum is 31.

The square root of 16381228 is about 4047.3729751531. The cubic root of 16381228 is about 253.9698436928.

Adding to 16381228 its reverse (82218361), we get a palindrome (98599589).

The spelling of 16381228 in words is "sixteen million, three hundred eighty-one thousand, two hundred twenty-eight".