1986447 has 4 divisors (see below), whose sum is σ = 2648600. Its totient is φ = 1324296.

The previous prime is 1986443. The next prime is 1986461. The reversal of 1986447 is 7446891.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7446891 = 3 ⋅2482297.

It is not a de Polignac number, because 1986447 - 2² = 1986443 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1986443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 331072 + ... + 331077.

It is an arithmetic number, because the mean of its divisors is an integer number (662150).

2^1986447 is an apocalyptic number.

1986447 is a deficient number, since it is larger than the sum of its proper divisors (662153).

1986447 is an equidigital number, since it uses as much as digits as its factorization.

1986447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662152.

The product of its digits is 48384, while the sum is 39.

The square root of 1986447 is about 1409.4137078942. The cubic root of 1986447 is about 125.7068645388.

The spelling of 1986447 in words is "one million, nine hundred eighty-six thousand, four hundred forty-seven".