840168308 has 18 divisors (see below), whose sum is σ = 1710343026. Its totient is φ = 360072048.

The previous prime is 840168299. The next prime is 840168331. The reversal of 840168308 is 803861048.

It can be written as a sum of positive squares in only one way, i.e., 509946724 + 330221584 = 22582^2 + 18172^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2143091 + ... + 2143482.

It is an arithmetic number, because the mean of its divisors is an integer number (95019057).

Almost surely, 2^840168308 is an apocalyptic number.

It is an amenable number.

840168308 is an abundant number, since it is smaller than the sum of its proper divisors (870174718).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

840168308 is a wasteful number, since it uses less digits than its factorization.

840168308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4286591 (or 4286582 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 38.

The square root of 840168308 is about 28985.6569358019. The cubic root of 840168308 is about 943.6018097627.

The spelling of 840168308 in words is "eight hundred forty million, one hundred sixty-eight thousand, three hundred eight".