206440493 has 4 divisors (see below), whose sum is σ = 235932000. Its totient is φ = 176948988.

The previous prime is 206440489. The next prime is 206440499. The reversal of 206440493 is 394044602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 206440493 - 2² = 206440489 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206440499) 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 in 3 ways as a sum of consecutive naturals, for example, 14745743 + ... + 14745756.

It is an arithmetic number, because the mean of its divisors is an integer number (58983000).

Almost surely, 2^206440493 is an apocalyptic number.

It is an amenable number.

206440493 is a deficient number, since it is larger than the sum of its proper divisors (29491507).

206440493 is an equidigital number, since it uses as much as digits as its factorization.

206440493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29491506.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 206440493 is about 14368.0372006757. The cubic root of 206440493 is about 591.0147174872.

The spelling of 206440493 in words is "two hundred six million, four hundred forty thousand, four hundred ninety-three".