394812865 has 4 divisors (see below), whose sum is σ = 473775444. Its totient is φ = 315850288.

The previous prime is 394812797. The next prime is 394812893. The reversal of 394812865 is 568218493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 568218493 = 6389 ⋅88937.

It can be written as a sum of positive squares in 2 ways, for example, as 219276864 + 175536001 = 14808^2 + 13249^2 .

It is a cyclic number.

It is not a de Polignac number, because 394812865 - 2¹¹ = 394810817 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39481282 + ... + 39481291.

It is an arithmetic number, because the mean of its divisors is an integer number (118443861).

Almost surely, 2^394812865 is an apocalyptic number.

It is an amenable number.

394812865 is a deficient number, since it is larger than the sum of its proper divisors (78962579).

394812865 is an equidigital number, since it uses as much as digits as its factorization.

394812865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78962578.

The product of its digits is 414720, while the sum is 46.

The square root of 394812865 is about 19869.8984647632. The cubic root of 394812865 is about 733.6075043471.

The spelling of 394812865 in words is "three hundred ninety-four million, eight hundred twelve thousand, eight hundred sixty-five".