396317491 has 2 divisors, whose sum is σ = 396317492. Its totient is φ = 396317490.

The previous prime is 396317477. The next prime is 396317513. The reversal of 396317491 is 194713693.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 396317491 - 2¹¹ = 396315443 is a prime.

It is not a weakly prime, because it can be changed into another prime (396317401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198158745 + 198158746.

It is an arithmetic number, because the mean of its divisors is an integer number (198158746).

Almost surely, 2^396317491 is an apocalyptic number.

396317491 is a deficient number, since it is larger than the sum of its proper divisors (1).

396317491 is an equidigital number, since it uses as much as digits as its factorization.

396317491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 43.

The square root of 396317491 is about 19907.7244053659. The cubic root of 396317491 is about 734.5382454560.

The spelling of 396317491 in words is "three hundred ninety-six million, three hundred seventeen thousand, four hundred ninety-one".