1228689 has 40 divisors (see below), whose sum is σ = 2299968. Its totient is φ = 635040.

The previous prime is 1228679. The next prime is 1228691. The reversal of 1228689 is 9868221.

It is not a de Polignac number, because 1228689 - 2⁵ = 1228657 is a prime.

1228689 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228679) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6139 + ... + 6335.

2^1228689 is an apocalyptic number.

It is an amenable number.

1228689 is a deficient number, since it is larger than the sum of its proper divisors (1071279).

1228689 is a wasteful number, since it uses less digits than its factorization.

1228689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227 (or 218 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 1228689 is about 1108.4624486197. The cubic root of 1228689 is about 107.1060467833.

The spelling of 1228689 in words is "one million, two hundred twenty-eight thousand, six hundred eighty-nine".