787221 has 12 divisors (see below), whose sum is σ = 1186848. Its totient is φ = 501864.

The previous prime is 787217. The next prime is 787243. The reversal of 787221 is 122787.

It is not a de Polignac number, because 787221 - 2² = 787217 is a prime.

787221 is a lucky 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 787221.

It is not an unprimeable number, because it can be changed into a prime (787261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1695 + ... + 2108.

It is an arithmetic number, because the mean of its divisors is an integer number (98904).

2⁷⁸⁷²²¹ is an apocalyptic number.

It is an amenable number.

787221 is a deficient number, since it is larger than the sum of its proper divisors (399627).

787221 is a wasteful number, since it uses less digits than its factorization.

787221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3832 (or 3829 counting only the distinct ones).

The product of its digits is 1568, while the sum is 27.

The square root of 787221 is about 887.2547548478. The cubic root of 787221 is about 92.3348306424.

The spelling of 787221 in words is "seven hundred eighty-seven thousand, two hundred twenty-one".