1783220985 has 96 divisors (see below), whose sum is σ = 3882278400. Its totient is φ = 752395392.

The previous prime is 1783220983. The next prime is 1783221007. The reversal of 1783220985 is 5890223871.

It is a happy number.

It is not a de Polignac number, because 1783220985 - 2¹ = 1783220983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1783220985.

It is not an unprimeable number, because it can be changed into a prime (1783220983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 196212 + ... + 205098.

It is an arithmetic number, because the mean of its divisors is an integer number (40440400).

Almost surely, 2^1783220985 is an apocalyptic number.

1783220985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1783220985 is an abundant number, since it is smaller than the sum of its proper divisors (2099057415).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1783220985 is a wasteful number, since it uses less digits than its factorization.

1783220985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8932 (or 8915 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 1783220985 is about 42228.2012996055. The cubic root of 1783220985 is about 1212.6488393472.

The spelling of 1783220985 in words is "one billion, seven hundred eighty-three million, two hundred twenty thousand, nine hundred eighty-five".