204644381 has 8 divisors (see below), whose sum is σ = 206399904. Its totient is φ = 202895280.

The previous prime is 204644327. The next prime is 204644399. The reversal of 204644381 is 183446402.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204644381 is a prime.

It is a super-2 number, since 2×204644381² = 83758645349746322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204644581) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 78755 + ... + 81311.

It is an arithmetic number, because the mean of its divisors is an integer number (25799988).

Almost surely, 2^204644381 is an apocalyptic number.

It is an amenable number.

204644381 is a deficient number, since it is larger than the sum of its proper divisors (1755523).

204644381 is a wasteful number, since it uses less digits than its factorization.

204644381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3211.

The product of its (nonzero) digits is 18432, while the sum is 32.

The square root of 204644381 is about 14305.3969186458. The cubic root of 204644381 is about 589.2957036967.

The spelling of 204644381 in words is "two hundred four million, six hundred forty-four thousand, three hundred eighty-one".