840840413 has 16 divisors (see below), whose sum is σ = 995441280. Its totient is φ = 694927296.

The previous prime is 840840391. The next prime is 840840439. The reversal of 840840413 is 314048048.

It is not a de Polignac number, because 840840413 - 2²⁶ = 773731549 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 840840413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840840443) 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, 175670 + ... + 180392.

It is an arithmetic number, because the mean of its divisors is an integer number (62215080).

Almost surely, 2^840840413 is an apocalyptic number.

It is an amenable number.

840840413 is a deficient number, since it is larger than the sum of its proper divisors (154600867).

840840413 is a wasteful number, since it uses less digits than its factorization.

840840413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5636.

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 840840413 is about 28997.2483694574. The cubic root of 840840413 is about 943.8533587484.

The spelling of 840840413 in words is "eight hundred forty million, eight hundred forty thousand, four hundred thirteen".