209489912 has 16 divisors (see below), whose sum is σ = 415899360. Its totient is φ = 98583424.

The previous prime is 209489899. The next prime is 209489923. The reversal of 209489912 is 219984902.

It is a super-3 number, since 3×209489912³ (a number of 26 digits) contains 333 as substring.

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 3 ways as a sum of consecutive naturals, for example, 770048 + ... + 770319.

It is an arithmetic number, because the mean of its divisors is an integer number (25993710).

Almost surely, 2^209489912 is an apocalyptic number.

It is an amenable number.

209489912 is a deficient number, since it is larger than the sum of its proper divisors (206409448).

209489912 is a wasteful number, since it uses less digits than its factorization.

209489912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1540390 (or 1540386 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 209489912 is about 14473.7663377574. The cubic root of 209489912 is about 593.9105474324.

The spelling of 209489912 in words is "two hundred nine million, four hundred eighty-nine thousand, nine hundred twelve".