393780121 has 8 divisors (see below), whose sum is σ = 459219200. Its totient is φ = 337525524.

The previous prime is 393780109. The next prime is 393780157. The reversal of 393780121 is 121087393.

It is not a de Polignac number, because 393780121 - 2¹³ = 393771929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (393780221) by changing a digit.

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, 573681 + ... + 574366.

It is an arithmetic number, because the mean of its divisors is an integer number (57402400).

Almost surely, 2^393780121 is an apocalyptic number.

It is an amenable number.

393780121 is a deficient number, since it is larger than the sum of its proper divisors (65439079).

393780121 is an equidigital number, since it uses as much as digits as its factorization.

393780121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1148068 (or 1148054 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 393780121 is about 19843.8937963294. The cubic root of 393780121 is about 732.9672936091.

The spelling of 393780121 in words is "three hundred ninety-three million, seven hundred eighty thousand, one hundred twenty-one".