1986109 has 2 divisors, whose sum is σ = 1986110. Its totient is φ = 1986108.

The previous prime is 1986097. The next prime is 1986121. The reversal of 1986109 is 9016891.

It is a balanced prime because it is at equal distance from previous prime (1986097) and next prime (1986121).

It can be written as a sum of positive squares in only one way, i.e., 1006009 + 980100 = 1003^2 + 990^2 .

It is a cyclic number.

It is not a de Polignac number, because 1986109 - 2¹¹ = 1984061 is a prime.

It is equal to p₁₄₇₉₅₈ and since 1986109 and 147958 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 (1986169) 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, 993054 + 993055.

It is an arithmetic number, because the mean of its divisors is an integer number (993055).

2^1986109 is an apocalyptic number.

It is an amenable number.

1986109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1986109 is an equidigital number, since it uses as much as digits as its factorization.

1986109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 1986109 is about 1409.2937947781. The cubic root of 1986109 is about 125.6997343326.

The spelling of 1986109 in words is "one million, nine hundred eighty-six thousand, one hundred nine".