866205340 has 192 divisors, whose sum is σ = 2495001600. Its totient is φ = 248935680.

The previous prime is 866205337. The next prime is 866205359. The reversal of 866205340 is 43502668.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 866205296 and 866205305.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 980539 + ... + 981421.

It is an arithmetic number, because the mean of its divisors is an integer number (12994800).

Almost surely, 2^866205340 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 866205340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1247500800).

866205340 is an abundant number, since it is smaller than the sum of its proper divisors (1628796260).

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

866205340 is a wasteful number, since it uses less digits than its factorization.

866205340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 937 (or 921 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 866205340 is about 29431.3666009582. The cubic root of 866205340 is about 953.2503035691.

The spelling of 866205340 in words is "eight hundred sixty-six million, two hundred five thousand, three hundred forty".