121908 has 12 divisors (see below), whose sum is σ = 284480. Its totient is φ = 40632.

The previous prime is 121889. The next prime is 121909. The reversal of 121908 is 809121.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5068 + ... + 5091.

2¹²¹⁹⁰⁸ is an apocalyptic number.

It is an amenable number.

121908 is an abundant number, since it is smaller than the sum of its proper divisors (162572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121908 is a wasteful number, since it uses less digits than its factorization.

121908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10166 (or 10164 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 121908 is about 349.1532614770. The cubic root of 121908 is about 49.5842865591.

The spelling of 121908 in words is "one hundred twenty-one thousand, nine hundred eight".