1918837 has 2 divisors, whose sum is σ = 1918838. Its totient is φ = 1918836.

The previous prime is 1918817. The next prime is 1918849. The reversal of 1918837 is 7388191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1825201 + 93636 = 1351^2 + 306^2 .

It is an emirp because it is prime and its reverse (7388191) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1918837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1918796 and 1918805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1918817) 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, 959418 + 959419.

It is an arithmetic number, because the mean of its divisors is an integer number (959419).

2^1918837 is an apocalyptic number.

It is an amenable number.

1918837 is a deficient number, since it is larger than the sum of its proper divisors (1).

1918837 is an equidigital number, since it uses as much as digits as its factorization.

1918837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 37.

The square root of 1918837 is about 1385.2209210086. The cubic root of 1918837 is about 124.2641999514.

It can be divided in two parts, 191883 and 7, that added together give a triangular number (191890 = T₆₁₉).

The spelling of 1918837 in words is "one million, nine hundred eighteen thousand, eight hundred thirty-seven".