866541492 has 18 divisors (see below), whose sum is σ = 2190424418. Its totient is φ = 288847152.

The previous prime is 866541479. The next prime is 866541499. The reversal of 866541492 is 294145668.

866541492 is a `hidden beast` number, since 8 + 66 + 541 + 49 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 855211536 + 11329956 = 29244^2 + 3366^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866541499) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12035263 + ... + 12035334.

Almost surely, 2^866541492 is an apocalyptic number.

It is an amenable number.

866541492 is an abundant number, since it is smaller than the sum of its proper divisors (1323882926).

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

866541492 is a wasteful number, since it uses less digits than its factorization.

866541492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24070607 (or 24070602 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 866541492 is about 29437.0768249838. The cubic root of 866541492 is about 953.3735982581.

The spelling of 866541492 in words is "eight hundred sixty-six million, five hundred forty-one thousand, four hundred ninety-two".