206784013 has 4 divisors (see below), whose sum is σ = 207570528. Its totient is φ = 205997500.

The previous prime is 206783989. The next prime is 206784029. The reversal of 206784013 is 310487602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 310487602 = 2 ⋅155243801.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206784013 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 (206784313) 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, 392863 + ... + 393388.

It is an arithmetic number, because the mean of its divisors is an integer number (51892632).

Almost surely, 2^206784013 is an apocalyptic number.

It is an amenable number.

206784013 is a deficient number, since it is larger than the sum of its proper divisors (786515).

206784013 is an equidigital number, since it uses as much as digits as its factorization.

206784013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786514.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 206784013 is about 14379.9865438046. The cubic root of 206784013 is about 591.3423548682.

The spelling of 206784013 in words is "two hundred six million, seven hundred eighty-four thousand, thirteen".