1780145 has 8 divisors (see below), whose sum is σ = 2143680. Its totient is φ = 1419120.

The previous prime is 1780133. The next prime is 1780147. The reversal of 1780145 is 5410871.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1780145 - 2⁶ = 1780081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1780147) 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 7 ways as a sum of consecutive naturals, for example, 1790 + ... + 2600.

It is an arithmetic number, because the mean of its divisors is an integer number (267960).

2^1780145 is an apocalyptic number.

It is an amenable number.

1780145 is a deficient number, since it is larger than the sum of its proper divisors (363535).

1780145 is an equidigital number, since it uses as much as digits as its factorization.

1780145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1255.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 1780145 is about 1334.2207463535. The cubic root of 1780145 is about 121.1951181106.

The spelling of 1780145 in words is "one million, seven hundred eighty thousand, one hundred forty-five".