840385292 has 54 divisors (see below), whose sum is σ = 1566109188. Its totient is φ = 394517088.

The previous prime is 840385291. The next prime is 840385297. The reversal of 840385292 is 292583048.

It is not an unprimeable number, because it can be changed into a prime (840385291) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 10125083 + ... + 10125165.

It is an arithmetic number, because the mean of its divisors is an integer number (29002022).

Almost surely, 2^840385292 is an apocalyptic number.

It is an amenable number.

840385292 is a deficient number, since it is larger than the sum of its proper divisors (725723896).

840385292 is a wasteful number, since it uses less digits than its factorization.

840385292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247 (or 165 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 840385292 is about 28989.3996488372. The cubic root of 840385292 is about 943.6830351035.

The spelling of 840385292 in words is "eight hundred forty million, three hundred eighty-five thousand, two hundred ninety-two".