393489381 has 8 divisors (see below), whose sum is σ = 530547840. Its totient is φ = 259378592.

The previous prime is 393489379. The next prime is 393489389. The reversal of 393489381 is 183984393.

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 393489381 - 2¹ = 393489379 is a prime.

It is a super-2 number, since 2×393489381² = 309667785919526322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 393489381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393489389) 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, 736605 + ... + 737138.

It is an arithmetic number, because the mean of its divisors is an integer number (66318480).

Almost surely, 2^393489381 is an apocalyptic number.

It is an amenable number.

393489381 is a deficient number, since it is larger than the sum of its proper divisors (137058459).

393489381 is a wasteful number, since it uses less digits than its factorization.

393489381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1473835.

The product of its digits is 559872, while the sum is 48.

The square root of 393489381 is about 19836.5667644378. The cubic root of 393489381 is about 732.7868584136.

The spelling of 393489381 in words is "three hundred ninety-three million, four hundred eighty-nine thousand, three hundred eighty-one".