1986145 has 8 divisors (see below), whose sum is σ = 2723904. Its totient is φ = 1361904.

The previous prime is 1986137. The next prime is 1986167. The reversal of 1986145 is 5416891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1986145 - 2³ = 1986137 is a prime.

It is a super-2 number, since 2×1986145² = 7889543922050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1986145.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28339 + ... + 28408.

It is an arithmetic number, because the mean of its divisors is an integer number (340488).

2^1986145 is an apocalyptic number.

It is an amenable number.

1986145 is a deficient number, since it is larger than the sum of its proper divisors (737759).

1986145 is an equidigital number, since it uses as much as digits as its factorization.

1986145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56759.

The product of its digits is 8640, while the sum is 34.

The square root of 1986145 is about 1409.3065670747. The cubic root of 1986145 is about 125.7004938013.

The spelling of 1986145 in words is "one million, nine hundred eighty-six thousand, one hundred forty-five".