865420877 has 2 divisors, whose sum is σ = 865420878. Its totient is φ = 865420876.

The previous prime is 865420841. The next prime is 865420883. The reversal of 865420877 is 778024568.

865420877 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 486378916 + 379041961 = 22054^2 + 19469^2 .

It is a cyclic number.

It is not a de Polignac number, because 865420877 - 2¹⁰ = 865419853 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 (865420807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432710438 + 432710439.

It is an arithmetic number, because the mean of its divisors is an integer number (432710439).

Almost surely, 2^865420877 is an apocalyptic number.

It is an amenable number.

865420877 is a deficient number, since it is larger than the sum of its proper divisors (1).

865420877 is an equidigital number, since it uses as much as digits as its factorization.

865420877 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 752640, while the sum is 47.

The square root of 865420877 is about 29418.0365932195. The cubic root of 865420877 is about 952.9624520969.

The spelling of 865420877 in words is "eight hundred sixty-five million, four hundred twenty thousand, eight hundred seventy-seven".