1078221 has 4 divisors (see below), whose sum is σ = 1437632. Its totient is φ = 718812.

The previous prime is 1078219. The next prime is 1078241. The reversal of 1078221 is 1228701.

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 not a de Polignac number, because 1078221 - 2¹ = 1078219 is a prime.

It is a D-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 (1078241) 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 3 ways as a sum of consecutive naturals, for example, 179701 + ... + 179706.

It is an arithmetic number, because the mean of its divisors is an integer number (359408).

2^1078221 is an apocalyptic number.

It is an amenable number.

1078221 is a deficient number, since it is larger than the sum of its proper divisors (359411).

1078221 is an equidigital number, since it uses as much as digits as its factorization.

1078221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359410.

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 1078221 is about 1038.3742100033. The cubic root of 1078221 is about 102.5421916330.

The spelling of 1078221 in words is "one million, seventy-eight thousand, two hundred twenty-one".