393420447 has 12 divisors (see below), whose sum is σ = 649456080. Its totient is φ = 224811648.

The previous prime is 393420439. The next prime is 393420481. The reversal of 393420447 is 744024393.

It is not a de Polignac number, because 393420447 - 2³ = 393420439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393420407) 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 11 ways as a sum of consecutive naturals, for example, 3122322 + ... + 3122447.

It is an arithmetic number, because the mean of its divisors is an integer number (54121340).

Almost surely, 2^393420447 is an apocalyptic number.

393420447 is a deficient number, since it is larger than the sum of its proper divisors (256035633).

393420447 is a wasteful number, since it uses less digits than its factorization.

393420447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6244782 (or 6244779 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 36.

The square root of 393420447 is about 19834.8291396725. The cubic root of 393420447 is about 732.7440644766.

The spelling of 393420447 in words is "three hundred ninety-three million, four hundred twenty thousand, four hundred forty-seven".