121997393 has 8 divisors (see below), whose sum is σ = 139495488. Its totient is φ = 104516784.

The previous prime is 121997387. The next prime is 121997417. The reversal of 121997393 is 393799121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121997393 - 2⁸ = 121997137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121997353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18755 + ... + 24407.

It is an arithmetic number, because the mean of its divisors is an integer number (17436936).

Almost surely, 2^121997393 is an apocalyptic number.

It is an amenable number.

121997393 is a deficient number, since it is larger than the sum of its proper divisors (17498095).

121997393 is an equidigital number, since it uses as much as digits as its factorization.

121997393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8743.

The product of its digits is 91854, while the sum is 44.

The square root of 121997393 is about 11045.2430032118. The cubic root of 121997393 is about 495.9640336065.

The spelling of 121997393 in words is "one hundred twenty-one million, nine hundred ninety-seven thousand, three hundred ninety-three".