206140242 has 32 divisors (see below), whose sum is σ = 514013184. Its totient is φ = 53542800.

The previous prime is 206140241. The next prime is 206140271. The reversal of 206140242 is 242041602.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (206140241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222634 + ... + 223557.

It is an arithmetic number, because the mean of its divisors is an integer number (16062912).

Almost surely, 2^206140242 is an apocalyptic number.

206140242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

206140242 is an abundant number, since it is smaller than the sum of its proper divisors (307872942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

206140242 is a wasteful number, since it uses less digits than its factorization.

206140242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446214.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 206140242 is about 14357.5848247538. The cubic root of 206140242 is about 590.7280507628.

Adding to 206140242 its reverse (242041602), we get a palindrome (448181844).

The spelling of 206140242 in words is "two hundred six million, one hundred forty thousand, two hundred forty-two".