866349138 has 32 divisors (see below), whose sum is σ = 1836380160. Its totient is φ = 271535360.

The previous prime is 866349109. The next prime is 866349151. The reversal of 866349138 is 831943668.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121903 + ... + 128813.

It is an arithmetic number, because the mean of its divisors is an integer number (57386880).

Almost surely, 2^866349138 is an apocalyptic number.

866349138 is an abundant number, since it is smaller than the sum of its proper divisors (970031022).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

866349138 is a wasteful number, since it uses less digits than its factorization.

866349138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8162.

The product of its digits is 746496, while the sum is 48.

The square root of 866349138 is about 29433.8094374479. The cubic root of 866349138 is about 953.3030500701.

The spelling of 866349138 in words is "eight hundred sixty-six million, three hundred forty-nine thousand, one hundred thirty-eight".