394108997 has 2 divisors, whose sum is σ = 394108998. Its totient is φ = 394108996.

The previous prime is 394108991. The next prime is 394109021. The reversal of 394108997 is 799801493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 306985441 + 87123556 = 17521^2 + 9334^2 .

It is an emirp because it is prime and its reverse (799801493) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 394108997 - 2¹² = 394104901 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394108991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197054498 + 197054499.

It is an arithmetic number, because the mean of its divisors is an integer number (197054499).

Almost surely, 2^394108997 is an apocalyptic number.

It is an amenable number.

394108997 is a deficient number, since it is larger than the sum of its proper divisors (1).

394108997 is an equidigital number, since it uses as much as digits as its factorization.

394108997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 394108997 is about 19852.1786461839. The cubic root of 394108997 is about 733.1712892418.

The spelling of 394108997 in words is "three hundred ninety-four million, one hundred eight thousand, nine hundred ninety-seven".