866440087 has 4 divisors (see below), whose sum is σ = 869734800. Its totient is φ = 863145376.

The previous prime is 866440079. The next prime is 866440103. The reversal of 866440087 is 780044668.

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

It is a cyclic number.

It is not a de Polignac number, because 866440087 - 2³ = 866440079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866410087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1646962 + ... + 1647487.

It is an arithmetic number, because the mean of its divisors is an integer number (217433700).

Almost surely, 2^866440087 is an apocalyptic number.

866440087 is a deficient number, since it is larger than the sum of its proper divisors (3294713).

866440087 is a wasteful number, since it uses less digits than its factorization.

866440087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3294712.

The product of its (nonzero) digits is 258048, while the sum is 43.

The square root of 866440087 is about 29435.3543719113. The cubic root of 866440087 is about 953.3364080323.

The spelling of 866440087 in words is "eight hundred sixty-six million, four hundred forty thousand, eighty-seven".