393393869 has 12 divisors (see below), whose sum is σ = 434930748. Its totient is φ = 355544640.

The previous prime is 393393859. The next prime is 393393911. The reversal of 393393869 is 968393393.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 326235844 + 67158025 = 18062^2 + 8195^2 .

It is a de Polignac number, because none of the positive numbers 2^k-393393869 is a prime.

It is a super-2 number, since 2×393393869² = 309517472333578322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 393393869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393393809) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11537 + ... + 30329.

It is an arithmetic number, because the mean of its divisors is an integer number (36244229).

Almost surely, 2^393393869 is an apocalyptic number.

It is an amenable number.

393393869 is a deficient number, since it is larger than the sum of its proper divisors (41536879).

393393869 is a wasteful number, since it uses less digits than its factorization.

393393869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18988 (or 18977 counting only the distinct ones).

The product of its digits is 2834352, while the sum is 53.

The square root of 393393869 is about 19834.1591452726. The cubic root of 393393869 is about 732.7275636309.

The spelling of 393393869 in words is "three hundred ninety-three million, three hundred ninety-three thousand, eight hundred sixty-nine".