121778387 has 8 divisors (see below), whose sum is σ = 124307520. Its totient is φ = 119266560.

The previous prime is 121778383. The next prime is 121778401. The reversal of 121778387 is 783877121.

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 121778387 - 2² = 121778383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121778383) 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, 10403 + ... + 18755.

It is an arithmetic number, because the mean of its divisors is an integer number (15538440).

Almost surely, 2^121778387 is an apocalyptic number.

121778387 is a deficient number, since it is larger than the sum of its proper divisors (2529133).

121778387 is an equidigital number, since it uses as much as digits as its factorization.

121778387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8653.

The product of its digits is 131712, while the sum is 44.

The square root of 121778387 is about 11035.3245081420. The cubic root of 121778387 is about 495.6670760023.

The spelling of 121778387 in words is "one hundred twenty-one million, seven hundred seventy-eight thousand, three hundred eighty-seven".