866885387 has 4 divisors (see below), whose sum is σ = 904576080. Its totient is φ = 829194696.

The previous prime is 866885381. The next prime is 866885399. The reversal of 866885387 is 783588668.

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 866885387 - 2²² = 862691083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866885381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18845312 + ... + 18845357.

It is an arithmetic number, because the mean of its divisors is an integer number (226144020).

Almost surely, 2^866885387 is an apocalyptic number.

866885387 is a deficient number, since it is larger than the sum of its proper divisors (37690693).

866885387 is a wasteful number, since it uses less digits than its factorization.

866885387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37690692.

The product of its digits is 15482880, while the sum is 59.

The square root of 866885387 is about 29442.9174335697. The cubic root of 866885387 is about 953.4996999526.

The spelling of 866885387 in words is "eight hundred sixty-six million, eight hundred eighty-five thousand, three hundred eighty-seven".