866408386 has 4 divisors (see below), whose sum is σ = 1299612582. Its totient is φ = 433204192.

The previous prime is 866408377. The next prime is 866408399. The reversal of 866408386 is 683804668.

866408386 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 817674025 + 48734361 = 28595^2 + 6981^2 .

It is a super-2 number, since 2×866408386² = 1501326982662249992, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 216602095 + ... + 216602098.

Almost surely, 2^866408386 is an apocalyptic number.

866408386 is a deficient number, since it is larger than the sum of its proper divisors (433204196).

866408386 is a wasteful number, since it uses less digits than its factorization.

866408386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433204195.

The product of its (nonzero) digits is 1327104, while the sum is 49.

The square root of 866408386 is about 29434.8158818770. The cubic root of 866408386 is about 953.3247811133.

The spelling of 866408386 in words is "eight hundred sixty-six million, four hundred eight thousand, three hundred eighty-six".