2156086842 has 64 divisors (see below), whose sum is σ = 5336857344. Its totient is φ = 565470720.

The previous prime is 2156086819. The next prime is 2156086847. The reversal of 2156086842 is 2486806512.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 2156086794 and 2156086803.

It is not an unprimeable number, because it can be changed into a prime (2156086847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87918 + ... + 109734.

It is an arithmetic number, because the mean of its divisors is an integer number (83388396).

Almost surely, 2^2156086842 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2156086842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2668428672).

2156086842 is an abundant number, since it is smaller than the sum of its proper divisors (3180770502).

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

2156086842 is a wasteful number, since it uses less digits than its factorization.

2156086842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22023.

The product of its (nonzero) digits is 184320, while the sum is 42.

The square root of 2156086842 is about 46433.6821929943. The cubic root of 2156086842 is about 1291.8797270200.

The spelling of 2156086842 in words is "two billion, one hundred fifty-six million, eighty-six thousand, eight hundred forty-two".