393663673 has 8 divisors (see below), whose sum is σ = 434286216. Its totient is φ = 354518400.

The previous prime is 393663623. The next prime is 393663691. The reversal of 393663673 is 376366393.

It can be written as a sum of positive squares in 4 ways, for example, as 514089 + 393149584 = 717^2 + 19828^2 .

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 393663673 - 2⁹ = 393663161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (393663623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 368758 + ... + 369823.

It is an arithmetic number, because the mean of its divisors is an integer number (54285777).

Almost surely, 2^393663673 is an apocalyptic number.

It is an amenable number.

393663673 is a deficient number, since it is larger than the sum of its proper divisors (40622543).

393663673 is a wasteful number, since it uses less digits than its factorization.

393663673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738635.

The product of its digits is 1102248, while the sum is 46.

The square root of 393663673 is about 19840.9594778075. The cubic root of 393663673 is about 732.8950358645.

The spelling of 393663673 in words is "three hundred ninety-three million, six hundred sixty-three thousand, six hundred seventy-three".