866387412 has 144 divisors (see below), whose sum is σ = 2539555200. Its totient is φ = 246516480.

The previous prime is 866387407. The next prime is 866387461. The reversal of 866387412 is 214783668.

866387412 is a `hidden beast` number, since 8 + 6 + 638 + 7 + 4 + 1 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 423889 + ... + 425927.

It is an arithmetic number, because the mean of its divisors is an integer number (17635800).

Almost surely, 2^866387412 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866387412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1269777600).

866387412 is an abundant number, since it is smaller than the sum of its proper divisors (1673167788).

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

866387412 is a wasteful number, since it uses less digits than its factorization.

866387412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2126 (or 2121 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 866387412 is about 29434.4596009507. The cubic root of 866387412 is about 953.3170883610.

The spelling of 866387412 in words is "eight hundred sixty-six million, three hundred eighty-seven thousand, four hundred twelve".