1782045 has 18 divisors (see below), whose sum is σ = 3104478. Its totient is φ = 945648.

The previous prime is 1782043. The next prime is 1782061. The reversal of 1782045 is 5402871.

It can be written as a sum of positive squares in only one way, i.e., 1425636 + 356409 = 1194^2 + 597^2 .

It is not a de Polignac number, because 1782045 - 2¹ = 1782043 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1782043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 8856 + ... + 9054.

It is an arithmetic number, because the mean of its divisors is an integer number (172471).

2^1782045 is an apocalyptic number.

1782045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1782045 is a deficient number, since it is larger than the sum of its proper divisors (1322433).

1782045 is an equidigital number, since it uses as much as digits as its factorization.

1782045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409 (or 207 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 1782045 is about 1334.9325825674. The cubic root of 1782045 is about 121.2382211252.

The spelling of 1782045 in words is "one million, seven hundred eighty-two thousand, forty-five".