209981146 has 8 divisors (see below), whose sum is σ = 315630720. Its totient is φ = 104770908.

The previous prime is 209981113. The next prime is 209981147. The reversal of 209981146 is 641189902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 209981099 and 209981108.

It is not an unprimeable number, because it can be changed into a prime (209981147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108636 + ... + 110551.

It is an arithmetic number, because the mean of its divisors is an integer number (39453840).

Almost surely, 2^209981146 is an apocalyptic number.

209981146 is a deficient number, since it is larger than the sum of its proper divisors (105649574).

209981146 is a wasteful number, since it uses less digits than its factorization.

209981146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219668.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 209981146 is about 14490.7262067848. The cubic root of 209981146 is about 594.3744063781.

The spelling of 209981146 in words is "two hundred nine million, nine hundred eighty-one thousand, one hundred forty-six".