1780213 has 4 divisors (see below), whose sum is σ = 1783008. Its totient is φ = 1777420.

The previous prime is 1780201. The next prime is 1780231. The reversal of 1780213 is 3120871.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1780213 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1780253) 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, 78 + ... + 1888.

It is an arithmetic number, because the mean of its divisors is an integer number (445752).

2^1780213 is an apocalyptic number.

It is an amenable number.

1780213 is a deficient number, since it is larger than the sum of its proper divisors (2795).

1780213 is an equidigital number, since it uses as much as digits as its factorization.

1780213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2794.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 1780213 is about 1334.2462291496. The cubic root of 1780213 is about 121.1966612738.

The spelling of 1780213 in words is "one million, seven hundred eighty thousand, two hundred thirteen".