206424138 has 8 divisors (see below), whose sum is σ = 412848288. Its totient is φ = 68808044.

The previous prime is 206424109. The next prime is 206424143. The reversal of 206424138 is 831424602.

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

206424138 is an admirable number.

It is a super-2 number, since 2×206424138² = 85221849498086088, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17202006 + ... + 17202017.

It is an arithmetic number, because the mean of its divisors is an integer number (51606036).

Almost surely, 2^206424138 is an apocalyptic number.

206424138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

206424138 is a wasteful number, since it uses less digits than its factorization.

206424138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34404028.

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 206424138 is about 14367.4680441614. The cubic root of 206424138 is about 590.9991095981. Note that the first 3 decimals are identical.

The spelling of 206424138 in words is "two hundred six million, four hundred twenty-four thousand, one hundred thirty-eight".