787609 has 2 divisors, whose sum is σ = 787610. Its totient is φ = 787608.

The previous prime is 787601. The next prime is 787621. The reversal of 787609 is 906787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 760384 + 27225 = 872^2 + 165^2 .

It is a cyclic number.

It is not a de Polignac number, because 787609 - 2³ = 787601 is a prime.

787609 is a lucky 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, 393804 + 393805.

It is an arithmetic number, because the mean of its divisors is an integer number (393805).

2⁷⁸⁷⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

787609 is a deficient number, since it is larger than the sum of its proper divisors (1).

787609 is an equidigital number, since it uses as much as digits as its factorization.

787609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 787609 is about 887.4733798825. The cubic root of 787609 is about 92.3499979334.

It can be divided in two parts, 7 and 87609, that added together give a square (87616 = 296²).

The spelling of 787609 in words is "seven hundred eighty-seven thousand, six hundred nine".