840408473 has 2 divisors, whose sum is σ = 840408474. Its totient is φ = 840408472.

The previous prime is 840408467. The next prime is 840408493. The reversal of 840408473 is 374804048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 840304144 + 104329 = 28988^2 + 323^2 .

It is a cyclic number.

It is not a de Polignac number, because 840408473 - 2¹² = 840404377 is a prime.

It is not a weakly prime, because it can be changed into another prime (840408433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420204236 + 420204237.

It is an arithmetic number, because the mean of its divisors is an integer number (420204237).

Almost surely, 2^840408473 is an apocalyptic number.

It is an amenable number.

840408473 is a deficient number, since it is larger than the sum of its proper divisors (1).

840408473 is an equidigital number, since it uses as much as digits as its factorization.

840408473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86016, while the sum is 38.

The square root of 840408473 is about 28989.7994646393. The cubic root of 840408473 is about 943.6917118044.

The spelling of 840408473 in words is "eight hundred forty million, four hundred eight thousand, four hundred seventy-three".