121997398 has 4 divisors (see below), whose sum is σ = 182996100. Its totient is φ = 60998698.

The previous prime is 121997387. The next prime is 121997417. The reversal of 121997398 is 893799121.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30499348 + ... + 30499351.

It is an arithmetic number, because the mean of its divisors is an integer number (45749025).

Almost surely, 2^121997398 is an apocalyptic number.

121997398 is a deficient number, since it is larger than the sum of its proper divisors (60998702).

121997398 is an equidigital number, since it uses as much as digits as its factorization.

121997398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60998701.

The product of its digits is 244944, while the sum is 49.

The square root of 121997398 is about 11045.2432295536. The cubic root of 121997398 is about 495.9640403821.

The spelling of 121997398 in words is "one hundred twenty-one million, nine hundred ninety-seven thousand, three hundred ninety-eight".