1985447 has 4 divisors (see below), whose sum is σ = 2102256. Its totient is φ = 1868640.

The previous prime is 1985441. The next prime is 1985453. The reversal of 1985447 is 7445891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7445891 = 19 ⋅391889.

It is an interprime number because it is at equal distance from previous prime (1985441) and next prime (1985453).

It is not a de Polignac number, because 1985447 - 2¹⁸ = 1723303 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 1985447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985441) 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 in 3 ways as a sum of consecutive naturals, for example, 58379 + ... + 58412.

It is an arithmetic number, because the mean of its divisors is an integer number (525564).

2^1985447 is an apocalyptic number.

1985447 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1985447 is a deficient number, since it is larger than the sum of its proper divisors (116809).

1985447 is a wasteful number, since it uses less digits than its factorization.

1985447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116808.

The product of its digits is 40320, while the sum is 38.

The square root of 1985447 is about 1409.0589057949. The cubic root of 1985447 is about 125.6857669100.

The spelling of 1985447 in words is "one million, nine hundred eighty-five thousand, four hundred forty-seven".