121646 has 8 divisors (see below), whose sum is σ = 208560. Its totient is φ = 52128.

The previous prime is 121637. The next prime is 121661. The reversal of 121646 is 646121.

It is a happy number.

121646 is nontrivially palindromic in base 11.

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

It is a congruent number.

It is an unprimeable number.

121646 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 3 ways as a sum of consecutive naturals, for example, 4331 + ... + 4358.

It is an arithmetic number, because the mean of its divisors is an integer number (26070).

2¹²¹⁶⁴⁶ is an apocalyptic number.

121646 is a deficient number, since it is larger than the sum of its proper divisors (86914).

121646 is an equidigital number, since it uses as much as digits as its factorization.

121646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8698.

The product of its digits is 288, while the sum is 20.

The square root of 121646 is about 348.7778662702. Note that the first 3 decimals coincide. The cubic root of 121646 is about 49.5487395322.

Adding to 121646 its reverse (646121), we get a palindrome (767767).

It can be divided in two parts, 121 and 646, that added together give a palindrome (767).

The spelling of 121646 in words is "one hundred twenty-one thousand, six hundred forty-six".