206681138 has 16 divisors (see below), whose sum is σ = 328580064. Its totient is φ = 97166400.

The previous prime is 206681129. The next prime is 206681141. The reversal of 206681138 is 831186602.

It is a junction number, because it is equal to n+sod(n) for n = 206681098 and 206681107.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42113 + ... + 46763.

It is an arithmetic number, because the mean of its divisors is an integer number (20536254).

Almost surely, 2^206681138 is an apocalyptic number.

206681138 is a deficient number, since it is larger than the sum of its proper divisors (121898926).

206681138 is a wasteful number, since it uses less digits than its factorization.

206681138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5977.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 206681138 is about 14376.4090787651. The cubic root of 206681138 is about 591.2442743718.

The spelling of 206681138 in words is "two hundred six million, six hundred eighty-one thousand, one hundred thirty-eight".