787321 has 8 divisors (see below), whose sum is σ = 862920. Its totient is φ = 715008.

The previous prime is 787309. The next prime is 787331. The reversal of 787321 is 123787.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 114921 + 672400 = 339^2 + 820^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 787321 - 2⁵ = 787289 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 787321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (787331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 306 + ... + 1291.

It is an arithmetic number, because the mean of its divisors is an integer number (107865).

2⁷⁸⁷³²¹ is an apocalyptic number.

It is an amenable number.

787321 is a deficient number, since it is larger than the sum of its proper divisors (75599).

787321 is a wasteful number, since it uses less digits than its factorization.

787321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1643.

The product of its digits is 2352, while the sum is 28.

The square root of 787321 is about 887.3111066588. The cubic root of 787321 is about 92.3387402146.

The spelling of 787321 in words is "seven hundred eighty-seven thousand, three hundred twenty-one".