205744409 has 8 divisors (see below), whose sum is σ = 221972352. Its totient is φ = 189573840.

The previous prime is 205744403. The next prime is 205744423. The reversal of 205744409 is 904447502.

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 205744409 - 2²⁴ = 188967193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205744403) 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, 6737 + ... + 21374.

It is an arithmetic number, because the mean of its divisors is an integer number (27746544).

Almost surely, 2^205744409 is an apocalyptic number.

It is an amenable number.

205744409 is a deficient number, since it is larger than the sum of its proper divisors (16227943).

205744409 is a wasteful number, since it uses less digits than its factorization.

205744409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28687.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 205744409 is about 14343.7933964485. The cubic root of 205744409 is about 590.3497007592.

The spelling of 205744409 in words is "two hundred five million, seven hundred forty-four thousand, four hundred nine".