393917047 has 8 divisors (see below), whose sum is σ = 419650416. Its totient is φ = 368468352.

The previous prime is 393916967. The next prime is 393917057. The reversal of 393917047 is 740719393.

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 393917047 - 2¹⁵ = 393884279 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 393916994 and 393917012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393917057) 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 7 ways as a sum of consecutive naturals, for example, 68308 + ... + 73849.

It is an arithmetic number, because the mean of its divisors is an integer number (52456302).

Almost surely, 2^393917047 is an apocalyptic number.

393917047 is a deficient number, since it is larger than the sum of its proper divisors (25733369).

393917047 is a wasteful number, since it uses less digits than its factorization.

393917047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142337.

The product of its (nonzero) digits is 142884, while the sum is 43.

The square root of 393917047 is about 19847.3435754007. The cubic root of 393917047 is about 733.0522400414.

The spelling of 393917047 in words is "three hundred ninety-three million, nine hundred seventeen thousand, forty-seven".