1228917 has 4 divisors (see below), whose sum is σ = 1638560. Its totient is φ = 819276.

The previous prime is 1228907. The next prime is 1228919. The reversal of 1228917 is 7198221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7198221 = 3 ⋅2399407.

It is not a de Polignac number, because 1228917 - 2⁷ = 1228789 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204817 + ... + 204822.

It is an arithmetic number, because the mean of its divisors is an integer number (409640).

2^1228917 is an apocalyptic number.

It is an amenable number.

1228917 is a deficient number, since it is larger than the sum of its proper divisors (409643).

1228917 is an equidigital number, since it uses as much as digits as its factorization.

1228917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409642.

The product of its digits is 2016, while the sum is 30.

The square root of 1228917 is about 1108.5652890110. The cubic root of 1228917 is about 107.1126713695.

It can be divided in two parts, 1228 and 917, that added together give a triangular number (2145 = T₆₅).

The spelling of 1228917 in words is "one million, two hundred twenty-eight thousand, nine hundred seventeen".