209889414 has 128 divisors (see below), whose sum is σ = 566092800. Its totient is φ = 56367360.

The previous prime is 209889403. The next prime is 209889469. The reversal of 209889414 is 414988902.

It is a super-2 number, since 2×209889414² = 88107132218526792, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 209889414.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 449209 + ... + 449675.

It is an arithmetic number, because the mean of its divisors is an integer number (4422600).

Almost surely, 2^209889414 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209889414, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (283046400).

209889414 is an abundant number, since it is smaller than the sum of its proper divisors (356203386).

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

209889414 is a wasteful number, since it uses less digits than its factorization.

209889414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555 (or 549 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 209889414 is about 14487.5606642388. The cubic root of 209889414 is about 594.2878413132.

The spelling of 209889414 in words is "two hundred nine million, eight hundred eighty-nine thousand, four hundred fourteen".