1986841 has 8 divisors (see below), whose sum is σ = 2133864. Its totient is φ = 1843200.

The previous prime is 1986839. The next prime is 1986869. The reversal of 1986841 is 1486891.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1299600 + 687241 = 1140^2 + 829^2 .

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

It is a 5-Lehmer number, since φ(1986841) divides (1986841-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 1986841 - 2¹ = 1986839 is a prime.

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 1986841.

It is not an unprimeable number, because it can be changed into a prime (1986871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 441 + ... + 2041.

It is an arithmetic number, because the mean of its divisors is an integer number (266733).

2^1986841 is an apocalyptic number.

It is an amenable number.

1986841 is a deficient number, since it is larger than the sum of its proper divisors (147023).

1986841 is a wasteful number, since it uses less digits than its factorization.

1986841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691.

The product of its digits is 13824, while the sum is 37.

The square root of 1986841 is about 1409.5534753957. The cubic root of 1986841 is about 125.7151750601.

The spelling of 1986841 in words is "one million, nine hundred eighty-six thousand, eight hundred forty-one".