393121399 has 4 divisors (see below), whose sum is σ = 428859720. Its totient is φ = 357383080.

The previous prime is 393121397. The next prime is 393121429. The reversal of 393121399 is 993121393.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 393121399 - 2¹ = 393121397 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393121397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17869144 + ... + 17869165.

It is an arithmetic number, because the mean of its divisors is an integer number (107214930).

Almost surely, 2^393121399 is an apocalyptic number.

393121399 is a deficient number, since it is larger than the sum of its proper divisors (35738321).

393121399 is a wasteful number, since it uses less digits than its factorization.

393121399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35738320.

The product of its digits is 39366, while the sum is 40.

The square root of 393121399 is about 19827.2892499202. The cubic root of 393121399 is about 732.5583588336.

The spelling of 393121399 in words is "three hundred ninety-three million, one hundred twenty-one thousand, three hundred ninety-nine".