206438397 has 16 divisors (see below), whose sum is σ = 301839168. Its totient is φ = 124462080.

The previous prime is 206438389. The next prime is 206438447. The reversal of 206438397 is 793834602.

It is not a de Polignac number, because 206438397 - 2³ = 206438389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206438377) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9838 + ... + 22575.

It is an arithmetic number, because the mean of its divisors is an integer number (18864948).

Almost surely, 2^206438397 is an apocalyptic number.

It is an amenable number.

206438397 is a deficient number, since it is larger than the sum of its proper divisors (95400771).

206438397 is a wasteful number, since it uses less digits than its factorization.

206438397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32620.

The product of its (nonzero) digits is 217728, while the sum is 42.

The square root of 206438397 is about 14367.9642608130. The cubic root of 206438397 is about 591.0127172804.

The spelling of 206438397 in words is "two hundred six million, four hundred thirty-eight thousand, three hundred ninety-seven".