209487013 has 8 divisors (see below), whose sum is σ = 223679808. Its totient is φ = 195717984.

The previous prime is 209486939. The next prime is 209487017. The reversal of 209487013 is 310784902.

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 209487013 - 2¹³ = 209478821 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 209487013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209487017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104920 + ... + 106897.

It is an arithmetic number, because the mean of its divisors is an integer number (27959976).

Almost surely, 2^209487013 is an apocalyptic number.

209487013 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

209487013 is the 7737-th centered heptagonal number.

It is an amenable number.

209487013 is a deficient number, since it is larger than the sum of its proper divisors (14192795).

209487013 is a wasteful number, since it uses less digits than its factorization.

209487013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211883.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 209487013 is about 14473.6661907065. Note that the first 3 decimals coincide. The cubic root of 209487013 is about 593.9078078341.

The spelling of 209487013 in words is "two hundred nine million, four hundred eighty-seven thousand, thirteen".