1986105 has 16 divisors (see below), whose sum is σ = 3466944. Its totient is φ = 962880.

The previous prime is 1986097. The next prime is 1986109. The reversal of 1986105 is 5016891.

It is a happy number.

It is not a de Polignac number, because 1986105 - 2³ = 1986097 is a prime.

It is a super-2 number, since 2×1986105² = 7889226142050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1986109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5854 + ... + 6183.

It is an arithmetic number, because the mean of its divisors is an integer number (216684).

2^1986105 is an apocalyptic number.

1986105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1986105 is a deficient number, since it is larger than the sum of its proper divisors (1480839).

1986105 is a wasteful number, since it uses less digits than its factorization.

1986105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12056.

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 1986105 is about 1409.2923756269. The cubic root of 1986105 is about 125.6996499466.

The spelling of 1986105 in words is "one million, nine hundred eighty-six thousand, one hundred five".