394036647 has 4 divisors (see below), whose sum is σ = 525382200. Its totient is φ = 262691096.

The previous prime is 394036627. The next prime is 394036651. The reversal of 394036647 is 746630493.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 394036647 - 2⁶ = 394036583 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 394036599 and 394036608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394036627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65672772 + ... + 65672777.

It is an arithmetic number, because the mean of its divisors is an integer number (131345550).

Almost surely, 2^394036647 is an apocalyptic number.

394036647 is a deficient number, since it is larger than the sum of its proper divisors (131345553).

394036647 is a wasteful number, since it uses less digits than its factorization.

394036647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131345552.

The product of its (nonzero) digits is 326592, while the sum is 42.

The square root of 394036647 is about 19850.3563444085. The cubic root of 394036647 is about 733.1264216295.

The spelling of 394036647 in words is "three hundred ninety-four million, thirty-six thousand, six hundred forty-seven".