121900785 has 32 divisors (see below), whose sum is σ = 199704960. Its totient is φ = 63475200.

The previous prime is 121900771. The next prime is 121900811. The reversal of 121900785 is 587009121.

It is not a de Polignac number, because 121900785 - 2⁶ = 121900721 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 159805 + ... + 160565.

It is an arithmetic number, because the mean of its divisors is an integer number (6240780).

Almost surely, 2^121900785 is an apocalyptic number.

121900785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121900785 is a deficient number, since it is larger than the sum of its proper divisors (77804175).

121900785 is a wasteful number, since it uses less digits than its factorization.

121900785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 121900785 is about 11040.8688516801. The cubic root of 121900785 is about 495.8330834136.

The spelling of 121900785 in words is "one hundred twenty-one million, nine hundred thousand, seven hundred eighty-five".