209090206 has 32 divisors (see below), whose sum is σ = 343848960. Its totient is φ = 94781664.

The previous prime is 209090173. The next prime is 209090221. The reversal of 209090206 is 602090902.

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 15 ways as a sum of consecutive naturals, for example, 436275 + ... + 436753.

It is an arithmetic number, because the mean of its divisors is an integer number (10745280).

Almost surely, 2^209090206 is an apocalyptic number.

209090206 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

209090206 is a deficient number, since it is larger than the sum of its proper divisors (134758754).

209090206 is a wasteful number, since it uses less digits than its factorization.

209090206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 209090206 is about 14459.9517979833. The cubic root of 209090206 is about 593.5325805465.

The spelling of 209090206 in words is "two hundred nine million, ninety thousand, two hundred six".