97839823 has 4 divisors (see below), whose sum is σ = 101213640. Its totient is φ = 94466008.

The previous prime is 97839799. The next prime is 97839827. The reversal of 97839823 is 32893879.

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

It is a cyclic number.

It is not a de Polignac number, because 97839823 - 2⁹ = 97839311 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97839827) 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 3 ways as a sum of consecutive naturals, for example, 1686865 + ... + 1686922.

It is an arithmetic number, because the mean of its divisors is an integer number (25303410).

Almost surely, 2^97839823 is an apocalyptic number.

97839823 is a deficient number, since it is larger than the sum of its proper divisors (3373817).

97839823 is a wasteful number, since it uses less digits than its factorization.

97839823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3373816.

The product of its digits is 653184, while the sum is 49.

The square root of 97839823 is about 9891.4014679417. The cubic root of 97839823 is about 460.7923065659.

The spelling of 97839823 in words is "ninety-seven million, eight hundred thirty-nine thousand, eight hundred twenty-three".