866415918 has 16 divisors (see below), whose sum is σ = 1753710336. Its totient is φ = 285325560.

The previous prime is 866415917. The next prime is 866415937. The reversal of 866415918 is 819514668.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866415917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 869398 + ... + 870393.

It is an arithmetic number, because the mean of its divisors is an integer number (109606896).

Almost surely, 2^866415918 is an apocalyptic number.

866415918 is an abundant number, since it is smaller than the sum of its proper divisors (887294418).

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

866415918 is a wasteful number, since it uses less digits than its factorization.

866415918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1739879.

The product of its digits is 414720, while the sum is 48.

The square root of 866415918 is about 29434.9438253243. The cubic root of 866415918 is about 953.3275436372.

The spelling of 866415918 in words is "eight hundred sixty-six million, four hundred fifteen thousand, nine hundred eighteen".