1288919 has 2 divisors, whose sum is σ = 1288920. Its totient is φ = 1288918.

The previous prime is 1288891. The next prime is 1288921. The reversal of 1288919 is 9198821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1288919 - 2¹² = 1284823 is a prime.

It is a super-2 number, since 2×1288919² = 3322624377122, which contains 22 as substring.

Together with 1288921, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1288939) 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, 644459 + 644460.

It is an arithmetic number, because the mean of its divisors is an integer number (644460).

2^1288919 is an apocalyptic number.

1288919 is a deficient number, since it is larger than the sum of its proper divisors (1).

1288919 is an equidigital number, since it uses as much as digits as its factorization.

1288919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 38.

The square root of 1288919 is about 1135.3056857076. The cubic root of 1288919 is about 108.8283075402.

The spelling of 1288919 in words is "one million, two hundred eighty-eight thousand, nine hundred nineteen".