121877789 has 8 divisors (see below), whose sum is σ = 136200960. Its totient is φ = 108095200.

The previous prime is 121877773. The next prime is 121877801. The reversal of 121877789 is 987778121.

It is a happy number.

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 121877789 - 2⁴ = 121877773 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 (121877719) 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, 134669 + ... + 135570.

It is an arithmetic number, because the mean of its divisors is an integer number (17025120).

Almost surely, 2^121877789 is an apocalyptic number.

It is an amenable number.

121877789 is a deficient number, since it is larger than the sum of its proper divisors (14323171).

121877789 is a wasteful number, since it uses less digits than its factorization.

121877789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270291.

The product of its digits is 395136, while the sum is 50.

The square root of 121877789 is about 11039.8273990131. The cubic root of 121877789 is about 495.8019026064.

The spelling of 121877789 in words is "one hundred twenty-one million, eight hundred seventy-seven thousand, seven hundred eighty-nine".