394949393 has 4 divisors (see below), whose sum is σ = 407689728. Its totient is φ = 382209060.

The previous prime is 394949329. The next prime is 394949407. The reversal of 394949393 is 393949493.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 394949393 - 2⁶ = 394949329 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (394945393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6370121 + ... + 6370182.

It is an arithmetic number, because the mean of its divisors is an integer number (101922432).

Almost surely, 2^394949393 is an apocalyptic number.

It is an amenable number.

394949393 is a deficient number, since it is larger than the sum of its proper divisors (12740335).

394949393 is a wasteful number, since it uses less digits than its factorization.

394949393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12740334.

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

The square root of 394949393 is about 19873.3337163144. Note that the first 3 decimals coincide. The cubic root of 394949393 is about 733.6920561533.

The spelling of 394949393 in words is "three hundred ninety-four million, nine hundred forty-nine thousand, three hundred ninety-three".