206630399 has 2 divisors, whose sum is σ = 206630400. Its totient is φ = 206630398.

The previous prime is 206630357. The next prime is 206630419. The reversal of 206630399 is 993036602.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206630399 is a prime.

It is a super-2 number, since 2×206630399² = 85392243581798402, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206630329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103315199 + 103315200.

It is an arithmetic number, because the mean of its divisors is an integer number (103315200).

Almost surely, 2^206630399 is an apocalyptic number.

206630399 is a deficient number, since it is larger than the sum of its proper divisors (1).

206630399 is an equidigital number, since it uses as much as digits as its factorization.

206630399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 38.

The square root of 206630399 is about 14374.6443086429. The cubic root of 206630399 is about 591.1958880850.

The spelling of 206630399 in words is "two hundred six million, six hundred thirty thousand, three hundred ninety-nine".