840873009 has 12 divisors (see below), whose sum is σ = 1161161456. Its totient is φ = 541249968.

The previous prime is 840872999. The next prime is 840873017. The reversal of 840873009 is 900378048.

It is not a de Polignac number, because 840873009 - 2⁴ = 840872993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (840873029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 164119 + ... + 169164.

Almost surely, 2^840873009 is an apocalyptic number.

It is an amenable number.

840873009 is a deficient number, since it is larger than the sum of its proper divisors (320288447).

840873009 is a wasteful number, since it uses less digits than its factorization.

840873009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333344 (or 333315 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 840873009 is about 28997.8104173401. The cubic root of 840873009 is about 943.8655550566.

The spelling of 840873009 in words is "eight hundred forty million, eight hundred seventy-three thousand, nine".