204979843 has 8 divisors (see below), whose sum is σ = 212060160. Its totient is φ = 197928840.

The previous prime is 204979807. The next prime is 204979877. The reversal of 204979843 is 348979402.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 204979843 - 2²⁵ = 171425411 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204979793 and 204979802.

It is not an unprimeable number, because it can be changed into a prime (204919843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7398 + ... + 21556.

It is an arithmetic number, because the mean of its divisors is an integer number (26507520).

Almost surely, 2^204979843 is an apocalyptic number.

204979843 is a deficient number, since it is larger than the sum of its proper divisors (7080317).

204979843 is a wasteful number, since it uses less digits than its factorization.

204979843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14657.

The product of its (nonzero) digits is 435456, while the sum is 46.

The square root of 204979843 is about 14317.1171329985. The cubic root of 204979843 is about 589.6175276562.

The spelling of 204979843 in words is "two hundred four million, nine hundred seventy-nine thousand, eight hundred forty-three".