206738539 has 12 divisors (see below), whose sum is σ = 241910256. Its totient is φ = 173072592.

The previous prime is 206738509. The next prime is 206738551. The reversal of 206738539 is 935837602.

It is not a de Polignac number, because 206738539 - 2²¹ = 204641387 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a junction number, because it is equal to n+sod(n) for n = 206738495 and 206738504.

It is not an unprimeable number, because it can be changed into a prime (206738509) 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 11 ways as a sum of consecutive naturals, for example, 4957 + ... + 20929.

It is an arithmetic number, because the mean of its divisors is an integer number (20159188).

Almost surely, 2^206738539 is an apocalyptic number.

206738539 is a deficient number, since it is larger than the sum of its proper divisors (35171717).

206738539 is an equidigital number, since it uses as much as digits as its factorization.

206738539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16066 (or 16023 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 43.

The square root of 206738539 is about 14378.4053010061. The cubic root of 206738539 is about 591.2990042028.

The spelling of 206738539 in words is "two hundred six million, seven hundred thirty-eight thousand, five hundred thirty-nine".