204857949 has 4 divisors (see below), whose sum is σ = 273143936. Its totient is φ = 136571964.

The previous prime is 204857923. The next prime is 204857957. The reversal of 204857949 is 949758402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 204857949 - 2⁸ = 204857693 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204857898 and 204857907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204857959) 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, 34142989 + ... + 34142994.

It is an arithmetic number, because the mean of its divisors is an integer number (68285984).

Almost surely, 2^204857949 is an apocalyptic number.

It is an amenable number.

204857949 is a deficient number, since it is larger than the sum of its proper divisors (68285987).

204857949 is an equidigital number, since it uses as much as digits as its factorization.

204857949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68285986.

The product of its (nonzero) digits is 725760, while the sum is 48.

The square root of 204857949 is about 14312.8595675358. The cubic root of 204857949 is about 589.5006298369.

The spelling of 204857949 in words is "two hundred four million, eight hundred fifty-seven thousand, nine hundred forty-nine".