840415343478 has 16 divisors (see below), whose sum is σ = 1701081660096. Its totient is φ = 276763285640.

The previous prime is 840415343429. The next prime is 840415343483. The reversal of 840415343478 is 874343514048.

It is a self number, because there is not a number n which added to its sum of digits gives 840415343478.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 843790008 + ... + 843791003.

It is an arithmetic number, because the mean of its divisors is an integer number (106317603756).

Almost surely, 2^840415343478 is an apocalyptic number.

840415343478 is an abundant number, since it is smaller than the sum of its proper divisors (860666316618).

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

840415343478 is a wasteful number, since it uses less digits than its factorization.

840415343478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1687581099.

The product of its (nonzero) digits is 5160960, while the sum is 51.

The spelling of 840415343478 in words is "eight hundred forty billion, four hundred fifteen million, three hundred forty-three thousand, four hundred seventy-eight".