827385709 has 4 divisors (see below), whose sum is σ = 827525916. Its totient is φ = 827245504.

The previous prime is 827385701. The next prime is 827385721. The reversal of 827385709 is 907583728.

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 171872100 + 655513609 = 13110^2 + 25603^2 .

It is a cyclic number.

It is not a de Polignac number, because 827385709 - 2³ = 827385701 is a prime.

It is a super-2 number, since 2×827385709² = 1369134222914865362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (827385701) 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, 60844 + ... + 73189.

It is an arithmetic number, because the mean of its divisors is an integer number (206881479).

Almost surely, 2^827385709 is an apocalyptic number.

It is an amenable number.

827385709 is a deficient number, since it is larger than the sum of its proper divisors (140207).

827385709 is a wasteful number, since it uses less digits than its factorization.

827385709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140206.

The product of its (nonzero) digits is 846720, while the sum is 49.

The square root of 827385709 is about 28764.3131153866. The cubic root of 827385709 is about 938.7919099991.

The spelling of 827385709 in words is "eight hundred twenty-seven million, three hundred eighty-five thousand, seven hundred nine".