1859985 has 12 divisors (see below), whose sum is σ = 3224052. Its totient is φ = 991968.

The previous prime is 1859983. The next prime is 1859999. The reversal of 1859985 is 5899581.

It can be written as a sum of positive squares in 2 ways, for example, as 1306449 + 553536 = 1143^2 + 744^2 .

It is not a de Polignac number, because 1859985 - 2¹ = 1859983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 41333 = 1859985 / (1 + 8 + 5 + 9 + 9 + 8 + 5).

1859985 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1859985.

It is not an unprimeable number, because it can be changed into a prime (1859983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20622 + ... + 20711.

It is an arithmetic number, because the mean of its divisors is an integer number (268671).

2^1859985 is an apocalyptic number.

1859985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1859985 is a deficient number, since it is larger than the sum of its proper divisors (1364067).

1859985 is a wasteful number, since it uses less digits than its factorization.

1859985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41344 (or 41341 counting only the distinct ones).

The product of its digits is 129600, while the sum is 45.

The square root of 1859985 is about 1363.8126704207. The cubic root of 1859985 is about 122.9805640517.

The spelling of 1859985 in words is "one million, eight hundred fifty-nine thousand, nine hundred eighty-five".