840202117 has 2 divisors, whose sum is σ = 840202118. Its totient is φ = 840202116.

The previous prime is 840202091. The next prime is 840202151. The reversal of 840202117 is 711202048.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 583753921 + 256448196 = 24161^2 + 16014^2 .

It is a cyclic number.

It is not a de Polignac number, because 840202117 - 2¹¹ = 840200069 is a prime.

It is a super-2 number, since 2×840202117² = 1411879194822563378, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 840202091 and 840202100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840202817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420101058 + 420101059.

It is an arithmetic number, because the mean of its divisors is an integer number (420101059).

Almost surely, 2^840202117 is an apocalyptic number.

It is an amenable number.

840202117 is a deficient number, since it is larger than the sum of its proper divisors (1).

840202117 is an equidigital number, since it uses as much as digits as its factorization.

840202117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 840202117 is about 28986.2401321731. The cubic root of 840202117 is about 943.6144666734.

The spelling of 840202117 in words is "eight hundred forty million, two hundred two thousand, one hundred seventeen".