394581377 has 2 divisors, whose sum is σ = 394581378. Its totient is φ = 394581376.

The previous prime is 394581371. The next prime is 394581389. The reversal of 394581377 is 773185493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 308388721 + 86192656 = 17561^2 + 9284^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394581377 is a prime.

It is a super-2 number, since 2×394581377² = 311388926150432258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (394581371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197290688 + 197290689.

It is an arithmetic number, because the mean of its divisors is an integer number (197290689).

Almost surely, 2^394581377 is an apocalyptic number.

It is an amenable number.

394581377 is a deficient number, since it is larger than the sum of its proper divisors (1).

394581377 is an equidigital number, since it uses as much as digits as its factorization.

394581377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 635040, while the sum is 47.

The square root of 394581377 is about 19864.0725179909. The cubic root of 394581377 is about 733.4640992474.

The spelling of 394581377 in words is "three hundred ninety-four million, five hundred eighty-one thousand, three hundred seventy-seven".