206642406 has 8 divisors (see below), whose sum is σ = 413284824. Its totient is φ = 68880800.

The previous prime is 206642399. The next prime is 206642437. The reversal of 206642406 is 604246602.

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

206642406 is an admirable number.

It is a super-3 number, since 3×206642406³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 17220195 + ... + 17220206.

It is an arithmetic number, because the mean of its divisors is an integer number (51660603).

Almost surely, 2^206642406 is an apocalyptic number.

206642406 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.

206642406 is a wasteful number, since it uses less digits than its factorization.

206642406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34440406.

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 206642406 is about 14375.0619476926. The cubic root of 206642406 is about 591.2073390486.

The spelling of 206642406 in words is "two hundred six million, six hundred forty-two thousand, four hundred six".