1918919 has 2 divisors, whose sum is σ = 1918920. Its totient is φ = 1918918.

The previous prime is 1918897. The next prime is 1918921. The reversal of 1918919 is 9198191.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1918919 is a prime.

It is a super-2 number, since 2×1918919² = 7364500257122, which contains 22 as substring.

Together with 1918921, 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 (1918979) 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, 959459 + 959460.

It is an arithmetic number, because the mean of its divisors is an integer number (959460).

2^1918919 is an apocalyptic number.

1918919 is a deficient number, since it is larger than the sum of its proper divisors (1).

1918919 is an equidigital number, since it uses as much as digits as its factorization.

1918919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 38.

The square root of 1918919 is about 1385.2505188593. The cubic root of 1918919 is about 124.2659700373.

The spelling of 1918919 in words is "one million, nine hundred eighteen thousand, nine hundred nineteen".