393881365 has 8 divisors (see below), whose sum is σ = 474272568. Its totient is φ = 314028480.

The previous prime is 393881363. The next prime is 393881387. The reversal of 393881365 is 563188393.

It can be written as a sum of positive squares in 4 ways, for example, as 109014481 + 284866884 = 10441^2 + 16878^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 393881365 - 2¹ = 393881363 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 (393881363) 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, 132966 + ... + 135895.

It is an arithmetic number, because the mean of its divisors is an integer number (59284071).

Almost surely, 2^393881365 is an apocalyptic number.

It is an amenable number.

393881365 is a deficient number, since it is larger than the sum of its proper divisors (80391203).

393881365 is a wasteful number, since it uses less digits than its factorization.

393881365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269159.

The product of its digits is 466560, while the sum is 46.

The square root of 393881365 is about 19846.4446438147. Note that the first 3 decimals coincide. The cubic root of 393881365 is about 733.0301054659.

The spelling of 393881365 in words is "three hundred ninety-three million, eight hundred eighty-one thousand, three hundred sixty-five".