209991034 has 16 divisors (see below), whose sum is σ = 344671776. Its totient is φ = 95158800.

The previous prime is 209991029. The next prime is 209991037. The reversal of 209991034 is 430199902.

It is a super-3 number, since 3×209991034³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 209990984 and 209991002.

It is not an unprimeable number, because it can be changed into a prime (209991037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7137 + ... + 21700.

It is an arithmetic number, because the mean of its divisors is an integer number (21541986).

Almost surely, 2^209991034 is an apocalyptic number.

209991034 is a deficient number, since it is larger than the sum of its proper divisors (134680742).

209991034 is a wasteful number, since it uses less digits than its factorization.

209991034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29181.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 209991034 is about 14491.0673864971. The cubic root of 209991034 is about 594.3837359172.

The spelling of 209991034 in words is "two hundred nine million, nine hundred ninety-one thousand, thirty-four".