394043697 has 72 divisors (see below), whose sum is σ = 650820352. Its totient is φ = 237945600.

The previous prime is 394043651. The next prime is 394043737. The reversal of 394043697 is 796340493.

It is not a de Polignac number, because 394043697 - 2¹⁰ = 394042673 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394042697) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2176947 + ... + 2177127.

Almost surely, 2^394043697 is an apocalyptic number.

It is an amenable number.

394043697 is a deficient number, since it is larger than the sum of its proper divisors (256776655).

394043697 is a wasteful number, since it uses less digits than its factorization.

394043697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261 (or 232 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 45.

The square root of 394043697 is about 19850.5339222904. The cubic root of 394043697 is about 733.1307939051.

The spelling of 394043697 in words is "three hundred ninety-four million, forty-three thousand, six hundred ninety-seven".