121997399 has 8 divisors (see below), whose sum is σ = 126407760. Its totient is φ = 117645696.

The previous prime is 121997387. The next prime is 121997417. The reversal of 121997399 is 993799121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121997399 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 (121997339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10409 + ... + 18770.

It is an arithmetic number, because the mean of its divisors is an integer number (15800970).

Almost surely, 2^121997399 is an apocalyptic number.

121997399 is a deficient number, since it is larger than the sum of its proper divisors (4410361).

121997399 is a wasteful number, since it uses less digits than its factorization.

121997399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29329.

The product of its digits is 275562, while the sum is 50.

The square root of 121997399 is about 11045.2432748220. The cubic root of 121997399 is about 495.9640417372.

The spelling of 121997399 in words is "one hundred twenty-one million, nine hundred ninety-seven thousand, three hundred ninety-nine".