206979808 has 96 divisors (see below), whose sum is σ = 493129728. Its totient is φ = 83635200.

The previous prime is 206979803. The next prime is 206979809. The reversal of 206979808 is 808979602.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206979803) 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 15 ways as a sum of consecutive naturals, for example, 284341 + ... + 285067.

It is an arithmetic number, because the mean of its divisors is an integer number (5136768).

Almost surely, 2^206979808 is an apocalyptic number.

206979808 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 206979808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246564864).

206979808 is an abundant number, since it is smaller than the sum of its proper divisors (286149920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

206979808 is a wasteful number, since it uses less digits than its factorization.

206979808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816 (or 808 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 206979808 is about 14386.7928323167. The cubic root of 206979808 is about 591.5289349797.

The spelling of 206979808 in words is "two hundred six million, nine hundred seventy-nine thousand, eight hundred eight".