869887221 has 32 divisors (see below), whose sum is σ = 1350635520. Its totient is φ = 487759104.

The previous prime is 869887217. The next prime is 869887259. The reversal of 869887221 is 122788968.

It is a happy number.

It is not a de Polignac number, because 869887221 - 2² = 869887217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (869887211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 242640 + ... + 246198.

It is an arithmetic number, because the mean of its divisors is an integer number (42207360).

Almost surely, 2^869887221 is an apocalyptic number.

It is an amenable number.

869887221 is a deficient number, since it is larger than the sum of its proper divisors (480748299).

869887221 is a wasteful number, since it uses less digits than its factorization.

869887221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3785.

The product of its digits is 774144, while the sum is 51.

The square root of 869887221 is about 29493.8505624478. The cubic root of 869887221 is about 954.5990188181.

The spelling of 869887221 in words is "eight hundred sixty-nine million, eight hundred eighty-seven thousand, two hundred twenty-one".