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1228 = 22307
BaseRepresentation
bin10011001100
31200111
4103030
514403
65404
73403
oct2314
91614
101228
11a17
12864
13736
1463a
1556d
hex4cc

1228 has 6 divisors (see below), whose sum is σ = 2156. Its totient is φ = 612.

The previous prime is 1223. The next prime is 1229. The reversal of 1228 is 8221.

It is a plaindrome in base 10, base 15 and base 16.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (1223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 150 + ... + 157.

It is an amenable number.

1228 is a deficient number, since it is larger than the sum of its proper divisors (928).

1228 is a wasteful number, since it uses less digits than its factorization.

1228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311 (or 309 counting only the distinct ones).

The product of its digits is 32, while the sum is 13.

The square root of 1228 is about 35.0428309359. The cubic root of 1228 is about 10.7086022767.

Adding to 1228 its reverse (8221), we get a palindrome (9449).

The spelling of 1228 in words is "one thousand, two hundred twenty-eight".

Divisors: 1 2 4 307 614 1228