204166138 has 8 divisors (see below), whose sum is σ = 334090080. Its totient is φ = 92802780.

The previous prime is 204166133. The next prime is 204166159. The reversal of 204166138 is 831661402.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (204166133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4640118 + ... + 4640161.

It is an arithmetic number, because the mean of its divisors is an integer number (41761260).

Almost surely, 2^204166138 is an apocalyptic number.

204166138 is a deficient number, since it is larger than the sum of its proper divisors (129923942).

204166138 is a wasteful number, since it uses less digits than its factorization.

204166138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9280292.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 204166138 is about 14288.6716667436. The cubic root of 204166138 is about 588.8362947663.

It can be divided in two parts, 204166 and 138, that added together give a square (204304 = 452²).

The spelling of 204166138 in words is "two hundred four million, one hundred sixty-six thousand, one hundred thirty-eight".