394829081 has 2 divisors, whose sum is σ = 394829082. Its totient is φ = 394829080.

The previous prime is 394829069. The next prime is 394829089. The reversal of 394829081 is 180928493.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 393427225 + 1401856 = 19835^2 + 1184^2 .

It is a cyclic number.

It is not a de Polignac number, because 394829081 - 2¹⁴ = 394812697 is a prime.

It is a super-2 number, since 2×394829081² = 311780006406609122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (394829089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197414540 + 197414541.

It is an arithmetic number, because the mean of its divisors is an integer number (197414541).

Almost surely, 2^394829081 is an apocalyptic number.

It is an amenable number.

394829081 is a deficient number, since it is larger than the sum of its proper divisors (1).

394829081 is an equidigital number, since it uses as much as digits as its factorization.

394829081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 394829081 is about 19870.3065149987. The cubic root of 394829081 is about 733.6175479378.

The spelling of 394829081 in words is "three hundred ninety-four million, eight hundred twenty-nine thousand, eighty-one".