786881 has 2 divisors, whose sum is σ = 786882. Its totient is φ = 786880.

The previous prime is 786859. The next prime is 786887. The reversal of 786881 is 188687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 614656 + 172225 = 784^2 + 415^2 .

It is an emirp because it is prime and its reverse (188687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 786881 - 2¹⁰ = 785857 is a prime.

It is a super-2 number, since 2×786881² = 1238363416322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (786887) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 393440 + 393441.

It is an arithmetic number, because the mean of its divisors is an integer number (393441).

2⁷⁸⁶⁸⁸¹ is an apocalyptic number.

It is an amenable number.

786881 is a deficient number, since it is larger than the sum of its proper divisors (1).

786881 is an equidigital number, since it uses as much as digits as its factorization.

786881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21504, while the sum is 38.

The square root of 786881 is about 887.0631319134. The cubic root of 786881 is about 92.3215356197.

The spelling of 786881 in words is "seven hundred eighty-six thousand, eight hundred eighty-one".