209793490 has 32 divisors (see below), whose sum is σ = 384134400. Its totient is φ = 82484544.

The previous prime is 209793473. The next prime is 209793491. The reversal of 209793490 is 94397902.

It is not an unprimeable number, because it can be changed into a prime (209793491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152787 + ... + 154153.

It is an arithmetic number, because the mean of its divisors is an integer number (12004200).

Almost surely, 2^209793490 is an apocalyptic number.

209793490 is a deficient number, since it is larger than the sum of its proper divisors (174340910).

209793490 is a wasteful number, since it uses less digits than its factorization.

209793490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1626.

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 209793490 is about 14484.2497216804. The cubic root of 209793490 is about 594.1972933871.

The spelling of 209793490 in words is "two hundred nine million, seven hundred ninety-three thousand, four hundred ninety".