209340247 has 8 divisors (see below), whose sum is σ = 211232736. Its totient is φ = 207453312.

The previous prime is 209340217. The next prime is 209340251. The reversal of 209340247 is 742043902.

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

It is a cyclic number.

It is not a de Polignac number, because 209340247 - 2²⁷ = 75122519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209340217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116518 + ... + 118300.

It is an arithmetic number, because the mean of its divisors is an integer number (26404092).

Almost surely, 2^209340247 is an apocalyptic number.

209340247 is a deficient number, since it is larger than the sum of its proper divisors (1892489).

209340247 is a wasteful number, since it uses less digits than its factorization.

209340247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2777.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 209340247 is about 14468.5951978760. The cubic root of 209340247 is about 593.7690787295.

The spelling of 209340247 in words is "two hundred nine million, three hundred forty thousand, two hundred forty-seven".