205289390 has 16 divisors (see below), whose sum is σ = 370264608. Its totient is φ = 81950496.

The previous prime is 205289389. The next prime is 205289393. The reversal of 205289390 is 93982502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205289393) 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 7 ways as a sum of consecutive naturals, for example, 15377 + ... + 25436.

It is an arithmetic number, because the mean of its divisors is an integer number (23141538).

Almost surely, 2^205289390 is an apocalyptic number.

205289390 is a deficient number, since it is larger than the sum of its proper divisors (164975218).

205289390 is a wasteful number, since it uses less digits than its factorization.

205289390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41323.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 205289390 is about 14327.9234364230. The cubic root of 205289390 is about 589.9141788414.

The spelling of 205289390 in words is "two hundred five million, two hundred eighty-nine thousand, three hundred ninety".