260399999 has 16 divisors (see below), whose sum is σ = 279417600. Its totient is φ = 241820160.

The previous prime is 260399983. The next prime is 260400013. The reversal of 260399999 is 999993062.

It is a cyclic number.

It is not a de Polignac number, because 260399999 - 2⁴ = 260399983 is a prime.

It is a Duffinian number.

260399999 is a modest number, since divided by 99999 gives 2603 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (260399299) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 564629 + ... + 565089.

It is an arithmetic number, because the mean of its divisors is an integer number (17463600).

Almost surely, 2^260399999 is an apocalyptic number.

260399999 is a deficient number, since it is larger than the sum of its proper divisors (19017601).

260399999 is a wasteful number, since it uses less digits than its factorization.

260399999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850.

The product of its (nonzero) digits is 2125764, while the sum is 56.

The square root of 260399999 is about 16136.9141721706. The cubic root of 260399999 is about 638.5775692744.

The spelling of 260399999 in words is "two hundred sixty million, three hundred ninety-nine thousand, nine hundred ninety-nine".