408491 has 2 divisors, whose sum is σ = 408492. Its totient is φ = 408490.

The previous prime is 408479. The next prime is 408497. The reversal of 408491 is 194804.

408491 = T₃₆₆ + T₃₆₇ + ... + T₃₇₁.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 408491 - 2⁶ = 408427 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 408491.

It is not a weakly prime, because it can be changed into another prime (408497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204245 + 204246.

It is an arithmetic number, because the mean of its divisors is an integer number (204246).

2⁴⁰⁸⁴⁹¹ is an apocalyptic number.

408491 is a deficient number, since it is larger than the sum of its proper divisors (1).

408491 is an equidigital number, since it uses as much as digits as its factorization.

408491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 408491 is about 639.1330065018. The cubic root of 408491 is about 74.1983357299.

The spelling of 408491 in words is "four hundred eight thousand, four hundred ninety-one".