866477 has 2 divisors, whose sum is σ = 866478. Its totient is φ = 866476.

The previous prime is 866471. The next prime is 866513. The reversal of 866477 is 774668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 546121 + 320356 = 739^2 + 566^2 .

It is a cyclic number.

It is not a de Polignac number, because 866477 - 2⁴ = 866461 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 866477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866471) 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, 433238 + 433239.

It is an arithmetic number, because the mean of its divisors is an integer number (433239).

2⁸⁶⁶⁴⁷⁷ is an apocalyptic number.

It is an amenable number.

866477 is a deficient number, since it is larger than the sum of its proper divisors (1).

866477 is an equidigital number, since it uses as much as digits as its factorization.

866477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 38.

The square root of 866477 is about 930.8474633365. The cubic root of 866477 is about 95.3349946190.

Subtracting from 866477 its reverse (774668), we obtain a square (91809 = 303²).

The spelling of 866477 in words is "eight hundred sixty-six thousand, four hundred seventy-seven".