121659378 has 32 divisors (see below), whose sum is σ = 258132096. Its totient is φ = 38093568.

The previous prime is 121659371. The next prime is 121659403. The reversal of 121659378 is 873956121.

It is not an unprimeable number, because it can be changed into a prime (121659371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78075 + ... + 79617.

It is an arithmetic number, because the mean of its divisors is an integer number (8066628).

Almost surely, 2^121659378 is an apocalyptic number.

121659378 is an abundant number, since it is smaller than the sum of its proper divisors (136472718).

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

121659378 is a wasteful number, since it uses less digits than its factorization.

121659378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2338.

The product of its digits is 90720, while the sum is 42.

The square root of 121659378 is about 11029.9310061305. The cubic root of 121659378 is about 495.5055583726.

The spelling of 121659378 in words is "one hundred twenty-one million, six hundred fifty-nine thousand, three hundred seventy-eight".