823539697 has 4 divisors (see below), whose sum is σ = 824274160. Its totient is φ = 822805236.

The previous prime is 823539671. The next prime is 823539701. The reversal of 823539697 is 796935328.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 823539697 - 2¹⁹ = 823015409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (823539617) 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, 365547 + ... + 367792.

It is an arithmetic number, because the mean of its divisors is an integer number (206068540).

Almost surely, 2^823539697 is an apocalyptic number.

It is an amenable number.

823539697 is a deficient number, since it is larger than the sum of its proper divisors (734463).

823539697 is a wasteful number, since it uses less digits than its factorization.

823539697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734462.

The product of its digits is 2449440, while the sum is 52.

The square root of 823539697 is about 28697.3813613716. The cubic root of 823539697 is about 937.3350264258.

The spelling of 823539697 in words is "eight hundred twenty-three million, five hundred thirty-nine thousand, six hundred ninety-seven".