1291228 has 6 divisors (see below), whose sum is σ = 2259656. Its totient is φ = 645612.

The previous prime is 1291223. The next prime is 1291229. The reversal of 1291228 is 8221921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161400 + ... + 161407.

2^1291228 is an apocalyptic number.

It is an amenable number.

1291228 is a deficient number, since it is larger than the sum of its proper divisors (968428).

1291228 is a wasteful number, since it uses less digits than its factorization.

1291228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322811 (or 322809 counting only the distinct ones).

The product of its digits is 576, while the sum is 25.

The square root of 1291228 is about 1136.3221374241. The cubic root of 1291228 is about 108.8932546416.

The spelling of 1291228 in words is "one million, two hundred ninety-one thousand, two hundred twenty-eight".