206749387 has 4 divisors (see below), whose sum is σ = 222653200. Its totient is φ = 190845576.

The previous prime is 206749339. The next prime is 206749391. The reversal of 206749387 is 783947602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 206749387 - 2¹⁹ = 206225099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206749307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7951887 + ... + 7951912.

It is an arithmetic number, because the mean of its divisors is an integer number (55663300).

Almost surely, 2^206749387 is an apocalyptic number.

206749387 is a deficient number, since it is larger than the sum of its proper divisors (15903813).

206749387 is a wasteful number, since it uses less digits than its factorization.

206749387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15903812.

The product of its (nonzero) digits is 508032, while the sum is 46.

The square root of 206749387 is about 14378.7825284340. The cubic root of 206749387 is about 591.3093462503.

The spelling of 206749387 in words is "two hundred six million, seven hundred forty-nine thousand, three hundred eighty-seven".