409840831 has 2 divisors, whose sum is σ = 409840832. Its totient is φ = 409840830.

The previous prime is 409840829. The next prime is 409840853. The reversal of 409840831 is 138048904.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 409840831 - 2¹ = 409840829 is a prime.

It is a super-2 number, since 2×409840831² = 335939013509541122, which contains 22 as substring.

Together with 409840829, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (409840331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204920415 + 204920416.

It is an arithmetic number, because the mean of its divisors is an integer number (204920416).

Almost surely, 2^409840831 is an apocalyptic number.

409840831 is a deficient number, since it is larger than the sum of its proper divisors (1).

409840831 is an equidigital number, since it uses as much as digits as its factorization.

409840831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 409840831 is about 20244.5259514764. The cubic root of 409840831 is about 742.7997367463.

The spelling of 409840831 in words is "four hundred nine million, eight hundred forty thousand, eight hundred thirty-one".