121397689 has 8 divisors (see below), whose sum is σ = 139010688. Its totient is φ = 103852320.

The previous prime is 121397687. The next prime is 121397693. The reversal of 121397689 is 986793121.

It is a happy number.

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 121397689 - 2¹ = 121397687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121397681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12997 + ... + 20290.

It is an arithmetic number, because the mean of its divisors is an integer number (17376336).

Almost surely, 2^121397689 is an apocalyptic number.

It is an amenable number.

121397689 is a deficient number, since it is larger than the sum of its proper divisors (17612999).

121397689 is an equidigital number, since it uses as much as digits as its factorization.

121397689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33815.

The product of its digits is 163296, while the sum is 46.

The square root of 121397689 is about 11018.0619439174. The cubic root of 121397689 is about 495.1500262863.

The spelling of 121397689 in words is "one hundred twenty-one million, three hundred ninety-seven thousand, six hundred eighty-nine".