204899749 has 4 divisors (see below), whose sum is σ = 208765836. Its totient is φ = 201033664.

The previous prime is 204899729. The next prime is 204899771. The reversal of 204899749 is 947998402.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 101002500 + 103897249 = 10050^2 + 10193^2 .

It is not a de Polignac number, because 204899749 - 2⁷ = 204899621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204899696 and 204899705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204899729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1932964 + ... + 1933069.

It is an arithmetic number, because the mean of its divisors is an integer number (52191459).

Almost surely, 2^204899749 is an apocalyptic number.

It is an amenable number.

204899749 is a deficient number, since it is larger than the sum of its proper divisors (3866087).

204899749 is an equidigital number, since it uses as much as digits as its factorization.

204899749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3866086.

The product of its (nonzero) digits is 1306368, while the sum is 52.

The square root of 204899749 is about 14314.3197183799. The cubic root of 204899749 is about 589.5407217651.

The spelling of 204899749 in words is "two hundred four million, eight hundred ninety-nine thousand, seven hundred forty-nine".