209489000 has 64 divisors (see below), whose sum is σ = 560252160. Its totient is φ = 71822400.

The previous prime is 209488969. The next prime is 209489017. The reversal of 209489000 is 984902.

It is a super-2 number, since 2×209489000² = 87771282242000000, which contains 22 as substring.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 7964 + ... + 21963.

It is an arithmetic number, because the mean of its divisors is an integer number (8753940).

Almost surely, 2^209489000 is an apocalyptic number.

209489000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209489000 is an abundant number, since it is smaller than the sum of its proper divisors (350763160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209489000 is a wasteful number, since it uses less digits than its factorization.

209489000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29955 (or 29941 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 209489000 is about 14473.7348324474. The cubic root of 209489000 is about 593.9096855815.

The spelling of 209489000 in words is "two hundred nine million, four hundred eighty-nine thousand".