394164649 has 2 divisors, whose sum is σ = 394164650. Its totient is φ = 394164648.

The previous prime is 394164643. The next prime is 394164691. The reversal of 394164649 is 946461493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 387814249 + 6350400 = 19693^2 + 2520^2 .

It is an emirp because it is prime and its reverse (946461493) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394164649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 394164599 and 394164608.

It is not a weakly prime, because it can be changed into another prime (394164643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197082324 + 197082325.

It is an arithmetic number, because the mean of its divisors is an integer number (197082325).

Almost surely, 2^394164649 is an apocalyptic number.

It is an amenable number.

394164649 is a deficient number, since it is larger than the sum of its proper divisors (1).

394164649 is an equidigital number, since it uses as much as digits as its factorization.

394164649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 46.

The square root of 394164649 is about 19853.5802564676. The cubic root of 394164649 is about 733.2057979086.

The spelling of 394164649 in words is "three hundred ninety-four million, one hundred sixty-four thousand, six hundred forty-nine".