787905 has 12 divisors (see below), whose sum is σ = 1365780. Its totient is φ = 420192.

The previous prime is 787903. The next prime is 787907. The reversal of 787905 is 509787.

It is an interprime number because it is at equal distance from previous prime (787903) and next prime (787907).

It can be written as a sum of positive squares in 2 ways, for example, as 97344 + 690561 = 312^2 + 831^2 .

It is not a de Polignac number, because 787905 - 2¹ = 787903 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 787905.

It is not an unprimeable number, because it can be changed into a prime (787903) 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, 8710 + ... + 8799.

It is an arithmetic number, because the mean of its divisors is an integer number (113815).

2⁷⁸⁷⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

787905 is a deficient number, since it is larger than the sum of its proper divisors (577875).

787905 is a wasteful number, since it uses less digits than its factorization.

787905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17520 (or 17517 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 36.

The square root of 787905 is about 887.6401297823. The cubic root of 787905 is about 92.3615655072.

The spelling of 787905 in words is "seven hundred eighty-seven thousand, nine hundred five".