206897243 has 16 divisors (see below), whose sum is σ = 242611200. Its totient is φ = 172758336.

The previous prime is 206897239. The next prime is 206897267. The reversal of 206897243 is 342798602.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 206897243 - 2² = 206897239 is a prime.

It is a super-2 number, since 2×206897243² = 85612938322002098, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 206897243.

It is not an unprimeable number, because it can be changed into a prime (206897203) 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, 75308 + ... + 78006.

It is an arithmetic number, because the mean of its divisors is an integer number (15163200).

Almost surely, 2^206897243 is an apocalyptic number.

206897243 is a deficient number, since it is larger than the sum of its proper divisors (35713957).

206897243 is a wasteful number, since it uses less digits than its factorization.

206897243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2986.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 206897243 is about 14383.9230740435. The cubic root of 206897243 is about 591.4502701693.

The spelling of 206897243 in words is "two hundred six million, eight hundred ninety-seven thousand, two hundred forty-three".