121646399 has 8 divisors (see below), whose sum is σ = 140375040. Its totient is φ = 103255416.

The previous prime is 121646389. The next prime is 121646401. The reversal of 121646399 is 993646121.

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 121646399 - 2⁸ = 121646143 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 (121646309) 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, 83639 + ... + 85080.

It is an arithmetic number, because the mean of its divisors is an integer number (17546880).

Almost surely, 2^121646399 is an apocalyptic number.

121646399 is a deficient number, since it is larger than the sum of its proper divisors (18728641).

121646399 is a wasteful number, since it uses less digits than its factorization.

121646399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168829.

The product of its digits is 69984, while the sum is 41.

The square root of 121646399 is about 11029.3426368030. The cubic root of 121646399 is about 495.4879370557.

The spelling of 121646399 in words is "one hundred twenty-one million, six hundred forty-six thousand, three hundred ninety-nine".