866149404 has 12 divisors (see below), whose sum is σ = 2021015304. Its totient is φ = 288716464.

The previous prime is 866149399. The next prime is 866149411. The reversal of 866149404 is 404941668.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36089547 + ... + 36089570.

It is an arithmetic number, because the mean of its divisors is an integer number (168417942).

Almost surely, 2^866149404 is an apocalyptic number.

It is an amenable number.

866149404 is an abundant number, since it is smaller than the sum of its proper divisors (1154865900).

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

866149404 is a wasteful number, since it uses less digits than its factorization.

866149404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72179124 (or 72179122 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 866149404 is about 29430.4163069434. The cubic root of 866149404 is about 953.2297841248.

The spelling of 866149404 in words is "eight hundred sixty-six million, one hundred forty-nine thousand, four hundred four".