840802129 has 16 divisors (see below), whose sum is σ = 887927040. Its totient is φ = 795277440.

The previous prime is 840802069. The next prime is 840802139. The reversal of 840802129 is 921208048.

It is a cyclic number.

It is not a de Polignac number, because 840802129 - 2⁹ = 840801617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 840802094 and 840802103.

It is not an unprimeable number, because it can be changed into a prime (840802139) 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, 208042 + ... + 212044.

It is an arithmetic number, because the mean of its divisors is an integer number (55495440).

Almost surely, 2^840802129 is an apocalyptic number.

It is an amenable number.

840802129 is a deficient number, since it is larger than the sum of its proper divisors (47124911).

840802129 is a wasteful number, since it uses less digits than its factorization.

840802129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4200.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 840802129 is about 28996.5882303419. The cubic root of 840802129 is about 943.8390337826.

The spelling of 840802129 in words is "eight hundred forty million, eight hundred two thousand, one hundred twenty-nine".