209349340 has 24 divisors (see below), whose sum is σ = 443100672. Its totient is φ = 83079360.

The previous prime is 209349331. The next prime is 209349359. The reversal of 209349340 is 43943902.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 209349296 and 209349305.

It is a congruent number.

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, 38671 + ... + 43750.

It is an arithmetic number, because the mean of its divisors is an integer number (18462528).

Almost surely, 2^209349340 is an apocalyptic number.

209349340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209349340 is an abundant number, since it is smaller than the sum of its proper divisors (233751332).

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

209349340 is a wasteful number, since it uses less digits than its factorization.

209349340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82557 (or 82555 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 209349340 is about 14468.9094267675. The cubic root of 209349340 is about 593.7776756813. Note that the first 3 decimals are identical.

The spelling of 209349340 in words is "two hundred nine million, three hundred forty-nine thousand, three hundred forty".