1228919 has 2 divisors, whose sum is σ = 1228920. Its totient is φ = 1228918.

The previous prime is 1228907. The next prime is 1228937. The reversal of 1228919 is 9198221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1228919 - 2¹² = 1224823 is a prime.

It is a super-2 number, since 2×1228919² = 3020483817122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is equal to p₉₄₉₇₃ and since 1228919 and 94973 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1228949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614459 + 614460.

It is an arithmetic number, because the mean of its divisors is an integer number (614460).

2^1228919 is an apocalyptic number.

1228919 is a deficient number, since it is larger than the sum of its proper divisors (1).

1228919 is an equidigital number, since it uses as much as digits as its factorization.

1228919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 32.

The square root of 1228919 is about 1108.5661910775. The cubic root of 1228919 is about 107.1127294762.

The spelling of 1228919 in words is "one million, two hundred twenty-eight thousand, nine hundred nineteen".