394919491 has 2 divisors, whose sum is σ = 394919492. Its totient is φ = 394919490.

The previous prime is 394919489. The next prime is 394919531. The reversal of 394919491 is 194919493.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 394919491 - 2¹ = 394919489 is a prime.

It is a super-2 number, since 2×394919491² = 311922808743398162, which contains 22 as substring.

Together with 394919489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (394919461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197459745 + 197459746.

It is an arithmetic number, because the mean of its divisors is an integer number (197459746).

Almost surely, 2^394919491 is an apocalyptic number.

394919491 is a deficient number, since it is larger than the sum of its proper divisors (1).

394919491 is an equidigital number, since it uses as much as digits as its factorization.

394919491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 314928, while the sum is 49.

The square root of 394919491 is about 19872.5813874293. The cubic root of 394919491 is about 733.6735395080.

The spelling of 394919491 in words is "three hundred ninety-four million, nine hundred nineteen thousand, four hundred ninety-one".