408438491 has 2 divisors, whose sum is σ = 408438492. Its totient is φ = 408438490.

The previous prime is 408438461. The next prime is 408438509. The reversal of 408438491 is 194834804.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 408438491 - 2¹⁴ = 408422107 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (408438461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204219245 + 204219246.

It is an arithmetic number, because the mean of its divisors is an integer number (204219246).

Almost surely, 2^408438491 is an apocalyptic number.

408438491 is a deficient number, since it is larger than the sum of its proper divisors (1).

408438491 is an equidigital number, since it uses as much as digits as its factorization.

408438491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 110592, while the sum is 41.

The square root of 408438491 is about 20209.8612315869. The cubic root of 408438491 is about 741.9515634741.

The spelling of 408438491 in words is "four hundred eight million, four hundred thirty-eight thousand, four hundred ninety-one".