406872491 has 2 divisors, whose sum is σ = 406872492. Its totient is φ = 406872490.

The previous prime is 406872469. The next prime is 406872527. The reversal of 406872491 is 194278604.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 406872491 - 2¹⁰ = 406871467 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (406872451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203436245 + 203436246.

It is an arithmetic number, because the mean of its divisors is an integer number (203436246).

Almost surely, 2^406872491 is an apocalyptic number.

406872491 is a deficient number, since it is larger than the sum of its proper divisors (1).

406872491 is an equidigital number, since it uses as much as digits as its factorization.

406872491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 406872491 is about 20171.0805610408. The cubic root of 406872491 is about 741.0021065442.

The spelling of 406872491 in words is "four hundred six million, eight hundred seventy-two thousand, four hundred ninety-one".