409474391 has 2 divisors, whose sum is σ = 409474392. Its totient is φ = 409474390.

The previous prime is 409474379. The next prime is 409474399. The reversal of 409474391 is 193474904.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 409474391 - 2⁶ = 409474327 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (409474399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204737195 + 204737196.

It is an arithmetic number, because the mean of its divisors is an integer number (204737196).

Almost surely, 2^409474391 is an apocalyptic number.

409474391 is a deficient number, since it is larger than the sum of its proper divisors (1).

409474391 is an equidigital number, since it uses as much as digits as its factorization.

409474391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 409474391 is about 20235.4735798301. The cubic root of 409474391 is about 742.5782908599.

The spelling of 409474391 in words is "four hundred nine million, four hundred seventy-four thousand, three hundred ninety-one".