206990975 has 6 divisors (see below), whose sum is σ = 256668840. Its totient is φ = 165592760.

The previous prime is 206990957. The next prime is 206990977. The reversal of 206990975 is 579099602.

It is not a de Polignac number, because 206990975 - 2²⁴ = 190213759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206990977) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4139795 + ... + 4139844.

It is an arithmetic number, because the mean of its divisors is an integer number (42778140).

Almost surely, 2^206990975 is an apocalyptic number.

206990975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

206990975 is a deficient number, since it is larger than the sum of its proper divisors (49677865).

206990975 is an equidigital number, since it uses as much as digits as its factorization.

206990975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8279649 (or 8279644 counting only the distinct ones).

The product of its (nonzero) digits is 306180, while the sum is 47.

The square root of 206990975 is about 14387.1809260883. The cubic root of 206990975 is about 591.5395728689.

The spelling of 206990975 in words is "two hundred six million, nine hundred ninety thousand, nine hundred seventy-five".