394530491 has 2 divisors, whose sum is σ = 394530492. Its totient is φ = 394530490.

The previous prime is 394530449. The next prime is 394530517. The reversal of 394530491 is 194035493.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 394530491 - 2²² = 390336187 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (394530091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197265245 + 197265246.

It is an arithmetic number, because the mean of its divisors is an integer number (197265246).

Almost surely, 2^394530491 is an apocalyptic number.

394530491 is a deficient number, since it is larger than the sum of its proper divisors (1).

394530491 is an equidigital number, since it uses as much as digits as its factorization.

394530491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 394530491 is about 19862.7916215219. The cubic root of 394530491 is about 733.4325682284.

The spelling of 394530491 in words is "three hundred ninety-four million, five hundred thirty thousand, four hundred ninety-one".