206440457 has 2 divisors, whose sum is σ = 206440458. Its totient is φ = 206440456.

The previous prime is 206440417. The next prime is 206440477. The reversal of 206440457 is 754044602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170668096 + 35772361 = 13064^2 + 5981^2 .

It is a cyclic number.

It is not a de Polignac number, because 206440457 - 2¹⁶ = 206374921 is a prime.

It is not a weakly prime, because it can be changed into another prime (206440417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103220228 + 103220229.

It is an arithmetic number, because the mean of its divisors is an integer number (103220229).

Almost surely, 2^206440457 is an apocalyptic number.

It is an amenable number.

206440457 is a deficient number, since it is larger than the sum of its proper divisors (1).

206440457 is an equidigital number, since it uses as much as digits as its factorization.

206440457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 32.

The square root of 206440457 is about 14368.0359478949. The cubic root of 206440457 is about 591.0146831326.

The spelling of 206440457 in words is "two hundred six million, four hundred forty thousand, four hundred fifty-seven".