209416990 has 16 divisors (see below), whose sum is σ = 377212320. Its totient is φ = 83708640.

The previous prime is 209416981. The next prime is 209417011. The reversal of 209416990 is 99614902.

It is a congruent number.

It is an unprimeable number.

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, 9751 + ... + 22669.

It is an arithmetic number, because the mean of its divisors is an integer number (23575770).

Almost surely, 2^209416990 is an apocalyptic number.

209416990 is a deficient number, since it is larger than the sum of its proper divisors (167795330).

209416990 is a wasteful number, since it uses less digits than its factorization.

209416990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14547.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 209416990 is about 14471.2470091558. The cubic root of 209416990 is about 593.8416273737.

The spelling of 209416990 in words is "two hundred nine million, four hundred sixteen thousand, nine hundred ninety".