787621 has 2 divisors, whose sum is σ = 787622. Its totient is φ = 787620.

The previous prime is 787609. The next prime is 787639. The reversal of 787621 is 126787.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 616225 + 171396 = 785^2 + 414^2 .

It is a cyclic number.

It is not a de Polignac number, because 787621 - 2¹¹ = 785573 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (787601) 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 as a sum of consecutive naturals, namely, 393810 + 393811.

It is an arithmetic number, because the mean of its divisors is an integer number (393811).

2⁷⁸⁷⁶²¹ is an apocalyptic number.

It is an amenable number.

787621 is a deficient number, since it is larger than the sum of its proper divisors (1).

787621 is an equidigital number, since it uses as much as digits as its factorization.

787621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4704, while the sum is 31.

The square root of 787621 is about 887.4801406229. The cubic root of 787621 is about 92.3504669455.

The spelling of 787621 in words is "seven hundred eighty-seven thousand, six hundred twenty-one".