863961005 has 4 divisors (see below), whose sum is σ = 1036753212. Its totient is φ = 691168800.

The previous prime is 863960987. The next prime is 863961071. The reversal of 863961005 is 500169368.

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

It can be written as a sum of positive squares in 2 ways, for example, as 244797316 + 619163689 = 15646^2 + 24883^2 .

It is not a de Polignac number, because 863961005 - 2⁶ = 863960941 is a prime.

It is a super-2 number, since 2×863961005² = 1492857236321220050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 863961005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86396096 + ... + 86396105.

It is an arithmetic number, because the mean of its divisors is an integer number (259188303).

Almost surely, 2^863961005 is an apocalyptic number.

It is an amenable number.

863961005 is a deficient number, since it is larger than the sum of its proper divisors (172792207).

863961005 is a wasteful number, since it uses less digits than its factorization.

863961005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172792206.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 863961005 is about 29393.2135874933. The cubic root of 863961005 is about 952.4263020987.

The spelling of 863961005 in words is "eight hundred sixty-three million, nine hundred sixty-one thousand, five".