206972287 has 4 divisors (see below), whose sum is σ = 211785640. Its totient is φ = 202158936.

The previous prime is 206972273. The next prime is 206972291. The reversal of 206972287 is 782279602.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 206972287 - 2¹⁵ = 206939519 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 4813309 = 206972287 / (2 + 0 + 6 + 9 + 7 + 2 + 2 + 8 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206972687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2406612 + ... + 2406697.

It is an arithmetic number, because the mean of its divisors is an integer number (52946410).

Almost surely, 2^206972287 is an apocalyptic number.

206972287 is a deficient number, since it is larger than the sum of its proper divisors (4813353).

206972287 is an equidigital number, since it uses as much as digits as its factorization.

206972287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4813352.

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 206972287 is about 14386.5314443753. The cubic root of 206972287 is about 591.5217701213.

The spelling of 206972287 in words is "two hundred six million, nine hundred seventy-two thousand, two hundred eighty-seven".