393856461 has 12 divisors (see below), whose sum is σ = 569086492. Its totient is φ = 262486656.

The previous prime is 393856403. The next prime is 393856481. The reversal of 393856461 is 164658393.

It can be written as a sum of positive squares in 2 ways, for example, as 17690436 + 376166025 = 4206^2 + 19395^2 .

It is not a de Polignac number, because 393856461 - 2¹⁰ = 393855437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393856481) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37215 + ... + 46611.

Almost surely, 2^393856461 is an apocalyptic number.

It is an amenable number.

393856461 is a deficient number, since it is larger than the sum of its proper divisors (175230031).

393856461 is a wasteful number, since it uses less digits than its factorization.

393856461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14060 (or 14057 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 393856461 is about 19845.8172167336. The cubic root of 393856461 is about 733.0146560030.

The spelling of 393856461 in words is "three hundred ninety-three million, eight hundred fifty-six thousand, four hundred sixty-one".