121586878 has 16 divisors (see below), whose sum is σ = 217497600. Its totient is φ = 49842936.

The previous prime is 121586849. The next prime is 121586887. The reversal of 121586878 is 878685121.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188478 + ... + 189121.

It is an arithmetic number, because the mean of its divisors is an integer number (13593600).

Almost surely, 2^121586878 is an apocalyptic number.

121586878 is a deficient number, since it is larger than the sum of its proper divisors (95910722).

121586878 is a wasteful number, since it uses less digits than its factorization.

121586878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377631.

The product of its digits is 215040, while the sum is 46.

The square root of 121586878 is about 11026.6440044104. The cubic root of 121586878 is about 495.4071105807.

The spelling of 121586878 in words is "one hundred twenty-one million, five hundred eighty-six thousand, eight hundred seventy-eight".