783221 has 4 divisors (see below), whose sum is σ = 784992. Its totient is φ = 781452.

The previous prime is 783197. The next prime is 783227. The reversal of 783221 is 122387.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-783221 is a prime.

It is a super-2 number, since 2×783221² = 1226870269682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 783221.

It is not an unprimeable number, because it can be changed into a prime (783227) 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, 440 + ... + 1326.

It is an arithmetic number, because the mean of its divisors is an integer number (196248).

2⁷⁸³²²¹ is an apocalyptic number.

It is an amenable number.

783221 is a deficient number, since it is larger than the sum of its proper divisors (1771).

783221 is an equidigital number, since it uses as much as digits as its factorization.

783221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1770.

The product of its digits is 672, while the sum is 23.

The square root of 783221 is about 884.9977401101. The cubic root of 783221 is about 92.1781755004.

The spelling of 783221 in words is "seven hundred eighty-three thousand, two hundred twenty-one".