204838138 has 16 divisors (see below), whose sum is σ = 320967360. Its totient is φ = 97858816.

The previous prime is 204838133. The next prime is 204838171. The reversal of 204838138 is 831838402.

It is a junction number, because it is equal to n+sod(n) for n = 204838097 and 204838106.

It is not an unprimeable number, because it can be changed into a prime (204838133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54153 + ... + 57811.

It is an arithmetic number, because the mean of its divisors is an integer number (20060460).

Almost surely, 2^204838138 is an apocalyptic number.

204838138 is a deficient number, since it is larger than the sum of its proper divisors (116129222).

204838138 is a wasteful number, since it uses less digits than its factorization.

204838138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4901.

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 204838138 is about 14312.1674808535. The cubic root of 204838138 is about 589.4816264681.

It can be divided in two parts, 2048 and 38138, that added together give a triangular number (40186 = T₂₈₃).

The spelling of 204838138 in words is "two hundred four million, eight hundred thirty-eight thousand, one hundred thirty-eight".