260806639 has 4 divisors (see below), whose sum is σ = 276148224. Its totient is φ = 245465056.

The previous prime is 260806613. The next prime is 260806661. The reversal of 260806639 is 936608062.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 260806639 - 2⁹ = 260806127 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (260806439) 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, 7670767 + ... + 7670800.

It is an arithmetic number, because the mean of its divisors is an integer number (69037056).

Almost surely, 2^260806639 is an apocalyptic number.

260806639 is a deficient number, since it is larger than the sum of its proper divisors (15341585).

260806639 is a wasteful number, since it uses less digits than its factorization.

260806639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15341584.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 260806639 is about 16149.5089399028. The cubic root of 260806639 is about 638.9097967880.

The spelling of 260806639 in words is "two hundred sixty million, eight hundred six thousand, six hundred thirty-nine".