209340906 has 16 divisors (see below), whose sum is σ = 419779584. Its totient is φ = 69597344.

The previous prime is 209340893. The next prime is 209340913. The reversal of 209340906 is 609043902.

It is a super-2 number, since 2×209340906² = 87647229849801672, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43251 + ... + 47846.

It is an arithmetic number, because the mean of its divisors is an integer number (26236224).

Almost surely, 2^209340906 is an apocalyptic number.

209340906 is an abundant number, since it is smaller than the sum of its proper divisors (210438678).

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

209340906 is a wasteful number, since it uses less digits than its factorization.

209340906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91485.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 209340906 is about 14468.6179713199. The cubic root of 209340906 is about 593.7697017876.

The spelling of 209340906 in words is "two hundred nine million, three hundred forty thousand, nine hundred six".