206440477 has 2 divisors, whose sum is σ = 206440478. Its totient is φ = 206440476.

The previous prime is 206440457. The next prime is 206440489. The reversal of 206440477 is 774044602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202464441 + 3976036 = 14229^2 + 1994^2 .

It is a cyclic number.

It is not a de Polignac number, because 206440477 - 2⁷ = 206440349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206440417) 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, 103220238 + 103220239.

It is an arithmetic number, because the mean of its divisors is an integer number (103220239).

Almost surely, 2^206440477 is an apocalyptic number.

It is an amenable number.

206440477 is a deficient number, since it is larger than the sum of its proper divisors (1).

206440477 is an equidigital number, since it uses as much as digits as its factorization.

206440477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37632, while the sum is 34.

The square root of 206440477 is about 14368.0366438842. The cubic root of 206440477 is about 591.0147022185.

The spelling of 206440477 in words is "two hundred six million, four hundred forty thousand, four hundred seventy-seven".