409831 has 2 divisors, whose sum is σ = 409832. Its totient is φ = 409830.

The previous prime is 409823. The next prime is 409841. The reversal of 409831 is 138904.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 409831 - 2³ = 409823 is a prime.

It is a super-2 number, since 2×409831² = 335922897122, which contains 22 as substring.

409831 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 409796 and 409805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (409841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204915 + 204916.

It is an arithmetic number, because the mean of its divisors is an integer number (204916).

2⁴⁰⁹⁸³¹ is an apocalyptic number.

409831 is a deficient number, since it is larger than the sum of its proper divisors (1).

409831 is an equidigital number, since it uses as much as digits as its factorization.

409831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 409831 is about 640.1804433127. The cubic root of 409831 is about 74.2793797430.

The spelling of 409831 in words is "four hundred nine thousand, eight hundred thirty-one".