206997649 has 8 divisors (see below), whose sum is σ = 209200640. Its totient is φ = 204800400.

The previous prime is 206997641. The next prime is 206997667. The reversal of 206997649 is 946799602.

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

It is a cyclic number.

It is not a de Polignac number, because 206997649 - 2³ = 206997641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 206997596 and 206997605.

It is not an unprimeable number, because it can be changed into a prime (206997641) 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 7 ways as a sum of consecutive naturals, for example, 139984 + ... + 141454.

It is an arithmetic number, because the mean of its divisors is an integer number (26150080).

Almost surely, 2^206997649 is an apocalyptic number.

It is an amenable number.

206997649 is a deficient number, since it is larger than the sum of its proper divisors (2202991).

206997649 is a wasteful number, since it uses less digits than its factorization.

206997649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2871.

The product of its (nonzero) digits is 1469664, while the sum is 52.

The square root of 206997649 is about 14387.4128668083. The cubic root of 206997649 is about 591.5459304612.

The spelling of 206997649 in words is "two hundred six million, nine hundred ninety-seven thousand, six hundred forty-nine".