2156362440 has 128 divisors (see below), whose sum is σ = 6873984000. Its totient is φ = 539612928.

The previous prime is 2156362427. The next prime is 2156362441. The reversal of 2156362440 is 442636512.

It is not an unprimeable number, because it can be changed into a prime (2156362441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 239541 + ... + 248379.

It is an arithmetic number, because the mean of its divisors is an integer number (53703000).

Almost surely, 2^2156362440 is an apocalyptic number.

2156362440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2156362440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3436992000).

2156362440 is an abundant number, since it is smaller than the sum of its proper divisors (4717621560).

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

2156362440 is a wasteful number, since it uses less digits than its factorization.

2156362440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8979 (or 8975 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 2156362440 is about 46436.6497499550. The cubic root of 2156362440 is about 1291.9347687579.

Adding to 2156362440 its reverse (442636512), we get a palindrome (2598998952).

The spelling of 2156362440 in words is "two billion, one hundred fifty-six million, three hundred sixty-two thousand, four hundred forty".