206009749 has 8 divisors (see below), whose sum is σ = 228422880. Its totient is φ = 184210800.

The previous prime is 206009737. The next prime is 206009767. The reversal of 206009749 is 947900602.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206009749 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 (206009719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152839 + ... + 154180.

It is an arithmetic number, because the mean of its divisors is an integer number (28552860).

Almost surely, 2^206009749 is an apocalyptic number.

It is an amenable number.

206009749 is a deficient number, since it is larger than the sum of its proper divisors (22413131).

206009749 is a wasteful number, since it uses less digits than its factorization.

206009749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307091.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 206009749 is about 14353.0397128971. The cubic root of 206009749 is about 590.6033748845.

The spelling of 206009749 in words is "two hundred six million, nine thousand, seven hundred forty-nine".