206428918 has 8 divisors (see below), whose sum is σ = 309865248. Its totient is φ = 103140504.

The previous prime is 206428903. The next prime is 206428919. The reversal of 206428918 is 819824602.

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

It is a super-2 number, since 2×206428918² = 85225796373301448, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206428919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33421 + ... + 39112.

It is an arithmetic number, because the mean of its divisors is an integer number (38733156).

Almost surely, 2^206428918 is an apocalyptic number.

206428918 is a deficient number, since it is larger than the sum of its proper divisors (103436330).

206428918 is a wasteful number, since it uses less digits than its factorization.

206428918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73958.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 206428918 is about 14367.6343912281. The cubic root of 206428918 is about 591.0036713287.

The spelling of 206428918 in words is "two hundred six million, four hundred twenty-eight thousand, nine hundred eighteen".