866908939 has 16 divisors (see below), whose sum is σ = 996855552. Its totient is φ = 747619488.

The previous prime is 866908907. The next prime is 866908943. The reversal of 866908939 is 939809668.

It is a cyclic number.

It is not a de Polignac number, because 866908939 - 2⁵ = 866908907 is a prime.

It is a super-2 number, since 2×866908939² = 1503062217036211442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866908979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20857 + ... + 46570.

It is an arithmetic number, because the mean of its divisors is an integer number (62303472).

Almost surely, 2^866908939 is an apocalyptic number.

866908939 is a deficient number, since it is larger than the sum of its proper divisors (129946613).

866908939 is a wasteful number, since it uses less digits than its factorization.

866908939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67506.

The product of its (nonzero) digits is 5038848, while the sum is 58.

The square root of 866908939 is about 29443.3173912180. The cubic root of 866908939 is about 953.5083349356.

The spelling of 866908939 in words is "eight hundred sixty-six million, nine hundred eight thousand, nine hundred thirty-nine".