393466681 has 8 divisors (see below), whose sum is σ = 412524864. Its totient is φ = 374571120.

The previous prime is 393466643. The next prime is 393466699. The reversal of 393466681 is 186664393.

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 393466681 - 2⁷ = 393466553 is a prime.

It is a super-2 number, since 2×393466681² = 309632058114311522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (393466181) 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, 35686 + ... + 45391.

It is an arithmetic number, because the mean of its divisors is an integer number (51565608).

Almost surely, 2^393466681 is an apocalyptic number.

It is an amenable number.

393466681 is a deficient number, since it is larger than the sum of its proper divisors (19058183).

393466681 is a wasteful number, since it uses less digits than its factorization.

393466681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81311.

The product of its digits is 559872, while the sum is 46.

The square root of 393466681 is about 19835.9945805599. The cubic root of 393466681 is about 732.7727669011.

The spelling of 393466681 in words is "three hundred ninety-three million, four hundred sixty-six thousand, six hundred eighty-one".