827871997 has 4 divisors (see below), whose sum is σ = 828373276. Its totient is φ = 827370720.

The previous prime is 827871983. The next prime is 827872007. The reversal of 827871997 is 799178728.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 144624676 + 683247321 = 12026^2 + 26139^2 .

It is a cyclic number.

It is not a de Polignac number, because 827871997 - 2¹⁹ = 827347709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (827871917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248154 + ... + 251467.

It is an arithmetic number, because the mean of its divisors is an integer number (207093319).

Almost surely, 2^827871997 is an apocalyptic number.

It is an amenable number.

827871997 is a deficient number, since it is larger than the sum of its proper divisors (501279).

827871997 is a wasteful number, since it uses less digits than its factorization.

827871997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501278.

The product of its digits is 3556224, while the sum is 58.

The square root of 827871997 is about 28772.7648480295. The cubic root of 827871997 is about 938.9757959527.

The spelling of 827871997 in words is "eight hundred twenty-seven million, eight hundred seventy-one thousand, nine hundred ninety-seven".