784221 has 4 divisors (see below), whose sum is σ = 1045632. Its totient is φ = 522812.

The previous prime is 784219. The next prime is 784229. The reversal of 784221 is 122487.

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, and also an emirpimes, since its reverse is a distinct semiprime: 122487 = 3 ⋅40829.

It is a cyclic number.

It is not a de Polignac number, because 784221 - 2¹ = 784219 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 784191 and 784200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (784229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130701 + ... + 130706.

It is an arithmetic number, because the mean of its divisors is an integer number (261408).

2⁷⁸⁴²²¹ is an apocalyptic number.

It is an amenable number.

784221 is a deficient number, since it is larger than the sum of its proper divisors (261411).

784221 is a wasteful number, since it uses less digits than its factorization.

784221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261410.

The product of its digits is 896, while the sum is 24.

The square root of 784221 is about 885.5625330828. The cubic root of 784221 is about 92.2173891974.

The spelling of 784221 in words is "seven hundred eighty-four thousand, two hundred twenty-one".