394088381 has 2 divisors, whose sum is σ = 394088382. Its totient is φ = 394088380.

The previous prime is 394088363. The next prime is 394088413. The reversal of 394088381 is 183880493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 352162756 + 41925625 = 18766^2 + 6475^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394088381 is a prime.

It is a super-2 number, since 2×394088381² = 310611304078402322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394088311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197044190 + 197044191.

It is an arithmetic number, because the mean of its divisors is an integer number (197044191).

Almost surely, 2^394088381 is an apocalyptic number.

It is an amenable number.

394088381 is a deficient number, since it is larger than the sum of its proper divisors (1).

394088381 is an equidigital number, since it uses as much as digits as its factorization.

394088381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 394088381 is about 19851.6594016722. The cubic root of 394088381 is about 733.1585048573.

The spelling of 394088381 in words is "three hundred ninety-four million, eighty-eight thousand, three hundred eighty-one".