840186392780 has 48 divisors (see below), whose sum is σ = 2019847959360. Its totient is φ = 287578103808.

The previous prime is 840186392743. The next prime is 840186392783. The reversal of 840186392780 is 87293681048.

It is a super-2 number, since 2×840186392780² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (840186392783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4977125 + ... + 5143164.

It is an arithmetic number, because the mean of its divisors is an integer number (42080165820).

Almost surely, 2^840186392780 is an apocalyptic number.

It is an amenable number.

840186392780 is an abundant number, since it is smaller than the sum of its proper divisors (1179661566580).

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

840186392780 is a wasteful number, since it uses less digits than its factorization.

840186392780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10120898 (or 10120896 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 56.

The spelling of 840186392780 in words is "eight hundred forty billion, one hundred eighty-six million, three hundred ninety-two thousand, seven hundred eighty".