867479209 has 3 divisors (see below), whose sum is σ = 867508663. Its totient is φ = 867449756.

The previous prime is 867479177. The next prime is 867479227. The reversal of 867479209 is 902974768.

The square root of 867479209 is 29453.

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

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 can be written as a sum of positive squares in only one way, i.e., 419225625 + 448253584 = 20475^2 + 21172^2 .

It is not a de Polignac number, because 867479209 - 2⁵ = 867479177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (867479269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 14727 + ... + 44179.

Almost surely, 2^867479209 is an apocalyptic number.

867479209 is the 29453-rd square number.

867479209 is the 14727-th centered octagonal number.

It is an amenable number.

867479209 is a deficient number, since it is larger than the sum of its proper divisors (29454).

867479209 is an frugal number, since it uses more digits than its factorization.

867479209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58906 (or 29453 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 52.

The cubic root of 867479209 is about 953.7173680438.

The spelling of 867479209 in words is "eight hundred sixty-seven million, four hundred seventy-nine thousand, two hundred nine".