206638442 has 8 divisors (see below), whose sum is σ = 317517732. Its totient is φ = 100799200.

The previous prime is 206638429. The next prime is 206638447. The reversal of 206638442 is 244836602.

It can be written as a sum of positive squares in 2 ways, for example, as 205951201 + 687241 = 14351^2 + 829^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (206638447) 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, 1259909 + ... + 1260072.

Almost surely, 2^206638442 is an apocalyptic number.

206638442 is a deficient number, since it is larger than the sum of its proper divisors (110879290).

206638442 is a wasteful number, since it uses less digits than its factorization.

206638442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2520024.

The product of its (nonzero) digits is 55296, while the sum is 35.

The square root of 206638442 is about 14374.9240693647. The cubic root of 206638442 is about 591.2035586680.

The spelling of 206638442 in words is "two hundred six million, six hundred thirty-eight thousand, four hundred forty-two".