840966009 has 16 divisors (see below), whose sum is σ = 1208132352. Its totient is φ = 517264128.

The previous prime is 840965989. The next prime is 840966029. The reversal of 840966009 is 900669048.

It is an interprime number because it is at equal distance from previous prime (840965989) and next prime (840966029).

It is not a de Polignac number, because 840966009 - 2¹¹ = 840963961 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (840966029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104017 + ... + 111809.

It is an arithmetic number, because the mean of its divisors is an integer number (75508272).

Almost surely, 2^840966009 is an apocalyptic number.

It is an amenable number.

840966009 is a deficient number, since it is larger than the sum of its proper divisors (367166343).

840966009 is a wasteful number, since it uses less digits than its factorization.

840966009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10576.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 840966009 is about 28999.4139423541. The cubic root of 840966009 is about 943.9003507431.

The spelling of 840966009 in words is "eight hundred forty million, nine hundred sixty-six thousand, nine".