42002019978 has 16 divisors (see below), whose sum is σ = 84006570720. Its totient is φ = 14000251536.

The previous prime is 42002019977. The next prime is 42002020057. The reversal of 42002019978 is 87991020024.

It is a super-2 number, since 2×42002019978² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42002019977) 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 7 ways as a sum of consecutive naturals, for example, 162801 + ... + 332427.

It is an arithmetic number, because the mean of its divisors is an integer number (5250410670).

Almost surely, 2^42002019978 is an apocalyptic number.

42002019978 is an abundant number, since it is smaller than the sum of its proper divisors (42004550742).

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

42002019978 is a wasteful number, since it uses less digits than its factorization.

42002019978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210901.

The product of its (nonzero) digits is 72576, while the sum is 42.

The spelling of 42002019978 in words is "forty-two billion, two million, nineteen thousand, nine hundred seventy-eight".