394643603 has 2 divisors, whose sum is σ = 394643604. Its totient is φ = 394643602.

The previous prime is 394643539. The next prime is 394643617. The reversal of 394643603 is 306346493.

It is a strong prime.

It is an emirp because it is prime and its reverse (306346493) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 394643603 - 2⁶ = 394643539 is a prime.

It is not a weakly prime, because it can be changed into another prime (394643633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197321801 + 197321802.

It is an arithmetic number, because the mean of its divisors is an integer number (197321802).

Almost surely, 2^394643603 is an apocalyptic number.

394643603 is a deficient number, since it is larger than the sum of its proper divisors (1).

394643603 is an equidigital number, since it uses as much as digits as its factorization.

394643603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 38.

The square root of 394643603 is about 19865.6387513717. The cubic root of 394643603 is about 733.5026533038.

The spelling of 394643603 in words is "three hundred ninety-four million, six hundred forty-three thousand, six hundred three".