2086257905 has 8 divisors (see below), whose sum is σ = 2504816232. Its totient is φ = 1668135168.

The previous prime is 2086257881. The next prime is 2086257917. The reversal of 2086257905 is 5097526802.

It can be written as a sum of positive squares in 4 ways, for example, as 692952976 + 1393304929 = 26324^2 + 37327^2 .

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 2086257905 - 2¹² = 2086253809 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98264 + ... + 117593.

It is an arithmetic number, because the mean of its divisors is an integer number (313102029).

Almost surely, 2^2086257905 is an apocalyptic number.

It is an amenable number.

2086257905 is a deficient number, since it is larger than the sum of its proper divisors (418558327).

2086257905 is a wasteful number, since it uses less digits than its factorization.

2086257905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217795.

The product of its (nonzero) digits is 302400, while the sum is 44.

The square root of 2086257905 is about 45675.5723007386. The cubic root of 2086257905 is about 1277.7797417165.

The spelling of 2086257905 in words is "two billion, eighty-six million, two hundred fifty-seven thousand, nine hundred five".