206123458 has 4 divisors (see below), whose sum is σ = 309185190. Its totient is φ = 103061728.

The previous prime is 206123383. The next prime is 206123461. The reversal of 206123458 is 854321602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 206123449 + 9 = 14357^2 + 3^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51530863 + ... + 51530866.

Almost surely, 2^206123458 is an apocalyptic number.

206123458 is a deficient number, since it is larger than the sum of its proper divisors (103061732).

206123458 is a wasteful number, since it uses less digits than its factorization.

206123458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103061731.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 206123458 is about 14357.0003134360. Note that the first 3 decimals coincide. The cubic root of 206123458 is about 590.7120179096.

The spelling of 206123458 in words is "two hundred six million, one hundred twenty-three thousand, four hundred fifty-eight".