394381903 has 2 divisors, whose sum is σ = 394381904. Its totient is φ = 394381902.

The previous prime is 394381847. The next prime is 394381909. The reversal of 394381903 is 309183493.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394381903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394381909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197190951 + 197190952.

It is an arithmetic number, because the mean of its divisors is an integer number (197190952).

Almost surely, 2^394381903 is an apocalyptic number.

394381903 is a deficient number, since it is larger than the sum of its proper divisors (1).

394381903 is an equidigital number, since it uses as much as digits as its factorization.

394381903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 394381903 is about 19859.0509088425. The cubic root of 394381903 is about 733.3404815878.

The spelling of 394381903 in words is "three hundred ninety-four million, three hundred eighty-one thousand, nine hundred three".