394403851 has 2 divisors, whose sum is σ = 394403852. Its totient is φ = 394403850.

The previous prime is 394403803. The next prime is 394403879. The reversal of 394403851 is 158304493.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 394403851 - 2¹⁷ = 394272779 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 394403851.

It is not a weakly prime, because it can be changed into another prime (394403351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197201925 + 197201926.

It is an arithmetic number, because the mean of its divisors is an integer number (197201926).

Almost surely, 2^394403851 is an apocalyptic number.

394403851 is a deficient number, since it is larger than the sum of its proper divisors (1).

394403851 is an equidigital number, since it uses as much as digits as its factorization.

394403851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 394403851 is about 19859.6034955384. The cubic root of 394403851 is about 733.3540852025.

The spelling of 394403851 in words is "three hundred ninety-four million, four hundred three thousand, eight hundred fifty-one".