394781801 has 2 divisors, whose sum is σ = 394781802. Its totient is φ = 394781800.

The previous prime is 394781771. The next prime is 394781809. The reversal of 394781801 is 108187493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198781801 + 196000000 = 14099^2 + 14000^2 .

It is an emirp because it is prime and its reverse (108187493) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 394781801 - 2²² = 390587497 is a prime.

It is not a weakly prime, because it can be changed into another prime (394781809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197390900 + 197390901.

It is an arithmetic number, because the mean of its divisors is an integer number (197390901).

Almost surely, 2^394781801 is an apocalyptic number.

It is an amenable number.

394781801 is a deficient number, since it is larger than the sum of its proper divisors (1).

394781801 is an equidigital number, since it uses as much as digits as its factorization.

394781801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 394781801 is about 19869.1167644664. The cubic root of 394781801 is about 733.5882636863.

The spelling of 394781801 in words is "three hundred ninety-four million, seven hundred eighty-one thousand, eight hundred one".