205490806 has 8 divisors (see below), whose sum is σ = 309029760. Its totient is φ = 102480888.

The previous prime is 205490777. The next prime is 205490807. The reversal of 205490806 is 608094502.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205490807) 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, 131286 + ... + 132841.

It is an arithmetic number, because the mean of its divisors is an integer number (38628720).

Almost surely, 2^205490806 is an apocalyptic number.

205490806 is a deficient number, since it is larger than the sum of its proper divisors (103538954).

205490806 is a wasteful number, since it uses less digits than its factorization.

205490806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264518.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 205490806 is about 14334.9505056697. The cubic root of 205490806 is about 590.1070436824.

The spelling of 205490806 in words is "two hundred five million, four hundred ninety thousand, eight hundred six".