206979395 has 16 divisors (see below), whose sum is σ = 285212928. Its totient is φ = 141251040.

The previous prime is 206979391. The next prime is 206979397. The reversal of 206979395 is 593979602.

It is not a de Polignac number, because 206979395 - 2² = 206979391 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206979391) 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, 6629 + ... + 21398.

It is an arithmetic number, because the mean of its divisors is an integer number (17825808).

Almost surely, 2^206979395 is an apocalyptic number.

206979395 is a deficient number, since it is larger than the sum of its proper divisors (78233533).

206979395 is a wasteful number, since it uses less digits than its factorization.

206979395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28250.

The product of its (nonzero) digits is 918540, while the sum is 50.

The square root of 206979395 is about 14386.7784788673. The cubic root of 206979395 is about 591.5285415409.

The spelling of 206979395 in words is "two hundred six million, nine hundred seventy-nine thousand, three hundred ninety-five".