866890249 has 3 divisors (see below), whose sum is σ = 866919693. Its totient is φ = 866860806.

The previous prime is 866890229. The next prime is 866890253. The reversal of 866890249 is 942098668.

The square root of 866890249 is 29443.

It is a perfect power (a square), and thus also a powerful number.

866890249 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 866890249 - 2¹³ = 866882057 is a prime.

It is a super-2 number, since 2×866890249² = 1502997407622564002, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 866890196 and 866890205.

It is not an unprimeable number, because it can be changed into a prime (866890229) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 14722 + ... + 44164.

It is an arithmetic number, because the mean of its divisors is an integer number (288973231).

Almost surely, 2^866890249 is an apocalyptic number.

866890249 is the 29443-rd square number.

866890249 is the 14722-nd centered octagonal number.

It is an amenable number.

866890249 is a deficient number, since it is larger than the sum of its proper divisors (29444).

866890249 is an frugal number, since it uses more digits than its factorization.

866890249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58886 (or 29443 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 52.

The cubic root of 866890249 is about 953.5014825439.

The spelling of 866890249 in words is "eight hundred sixty-six million, eight hundred ninety thousand, two hundred forty-nine".