206400673 has 4 divisors (see below), whose sum is σ = 207130288. Its totient is φ = 205671060.

The previous prime is 206400661. The next prime is 206400721. The reversal of 206400673 is 376004602.

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 a de Polignac number, because none of the positive numbers 2^k-206400673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206400613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 364383 + ... + 364948.

It is an arithmetic number, because the mean of its divisors is an integer number (51782572).

Almost surely, 2^206400673 is an apocalyptic number.

It is an amenable number.

206400673 is a deficient number, since it is larger than the sum of its proper divisors (729615).

206400673 is an equidigital number, since it uses as much as digits as its factorization.

206400673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729614.

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 206400673 is about 14366.6514191721. The cubic root of 206400673 is about 590.9767150601.

The spelling of 206400673 in words is "two hundred six million, four hundred thousand, six hundred seventy-three".