785921 has 2 divisors, whose sum is σ = 785922. Its totient is φ = 785920.

The previous prime is 785903. The next prime is 785923. The reversal of 785921 is 129587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 698896 + 87025 = 836^2 + 295^2 .

It is an emirp because it is prime and its reverse (129587) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 785921 - 2⁶ = 785857 is a prime.

Together with 785923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (785923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 392960 + 392961.

It is an arithmetic number, because the mean of its divisors is an integer number (392961).

2⁷⁸⁵⁹²¹ is an apocalyptic number.

It is an amenable number.

785921 is a deficient number, since it is larger than the sum of its proper divisors (1).

785921 is an equidigital number, since it uses as much as digits as its factorization.

785921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 32.

The square root of 785921 is about 886.5218553426. The cubic root of 785921 is about 92.2839760475.

The spelling of 785921 in words is "seven hundred eighty-five thousand, nine hundred twenty-one".