206640973 has 8 divisors (see below), whose sum is σ = 257630400. Its totient is φ = 161018880.

The previous prime is 206640923. The next prime is 206640989. The reversal of 206640973 is 379046602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 206640973 - 2¹³ = 206632781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206640923) 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 7 ways as a sum of consecutive naturals, for example, 1341748 + ... + 1341901.

It is an arithmetic number, because the mean of its divisors is an integer number (32203800).

Almost surely, 2^206640973 is an apocalyptic number.

It is an amenable number.

206640973 is a deficient number, since it is larger than the sum of its proper divisors (50989427).

206640973 is a wasteful number, since it uses less digits than its factorization.

206640973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2683667.

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 206640973 is about 14375.0121043427. The cubic root of 206640973 is about 591.2059724332.

The spelling of 206640973 in words is "two hundred six million, six hundred forty thousand, nine hundred seventy-three".