204453857 has 4 divisors (see below), whose sum is σ = 211504020. Its totient is φ = 197403696.

The previous prime is 204453853. The next prime is 204453869. The reversal of 204453857 is 758354402.

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 97930816 + 106523041 = 9896^2 + 10321^2 .

It is not a de Polignac number, because 204453857 - 2² = 204453853 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 204453857.

It is not an unprimeable number, because it can be changed into a prime (204453853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3525038 + ... + 3525095.

It is an arithmetic number, because the mean of its divisors is an integer number (52876005).

Almost surely, 2^204453857 is an apocalyptic number.

It is an amenable number.

204453857 is a deficient number, since it is larger than the sum of its proper divisors (7050163).

204453857 is an equidigital number, since it uses as much as digits as its factorization.

204453857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7050162.

The product of its (nonzero) digits is 134400, while the sum is 38.

The square root of 204453857 is about 14298.7362028957. The cubic root of 204453857 is about 589.1127687360.

The spelling of 204453857 in words is "two hundred four million, four hundred fifty-three thousand, eight hundred fifty-seven".