408631 has 2 divisors, whose sum is σ = 408632. Its totient is φ = 408630.

The previous prime is 408623. The next prime is 408637. The reversal of 408631 is 136804.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 408631 - 2³ = 408623 is a prime.

It is a super-2 number, since 2×408631² = 333958588322, which contains 22 as substring.

408631 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (408637) 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, 204315 + 204316.

It is an arithmetic number, because the mean of its divisors is an integer number (204316).

2⁴⁰⁸⁶³¹ is an apocalyptic number.

408631 is a deficient number, since it is larger than the sum of its proper divisors (1).

408631 is an equidigital number, since it uses as much as digits as its factorization.

408631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 408631 is about 639.2425204881. The cubic root of 408631 is about 74.2068112985.

The spelling of 408631 in words is "four hundred eight thousand, six hundred thirty-one".