206978007 has 4 divisors (see below), whose sum is σ = 275970680. Its totient is φ = 137985336.

The previous prime is 206978003. The next prime is 206978011. The reversal of 206978007 is 700879602.

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

It is an interprime number because it is at equal distance from previous prime (206978003) and next prime (206978011).

It is not a de Polignac number, because 206978007 - 2² = 206978003 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 (206978003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34496332 + ... + 34496337.

It is an arithmetic number, because the mean of its divisors is an integer number (68992670).

Almost surely, 2^206978007 is an apocalyptic number.

206978007 is a deficient number, since it is larger than the sum of its proper divisors (68992673).

206978007 is an equidigital number, since it uses as much as digits as its factorization.

206978007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68992672.

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 206978007 is about 14386.7302400511. The cubic root of 206978007 is about 591.5272192782.

The spelling of 206978007 in words is "two hundred six million, nine hundred seventy-eight thousand, seven".