2195891540 has 24 divisors (see below), whose sum is σ = 4736005512. Its totient is φ = 854616960.

The previous prime is 2195891531. The next prime is 2195891543. The reversal of 2195891540 is 451985912.

It can be written as a sum of positive squares in 4 ways, for example, as 659565124 + 1536326416 = 25682^2 + 39196^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2195891491 and 2195891500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2195891543) 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 7 ways as a sum of consecutive naturals, for example, 1482971 + ... + 1484450.

It is an arithmetic number, because the mean of its divisors is an integer number (197333563).

Almost surely, 2^2195891540 is an apocalyptic number.

2195891540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2195891540 is an abundant number, since it is smaller than the sum of its proper divisors (2540113972).

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

2195891540 is a wasteful number, since it uses less digits than its factorization.

2195891540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2967467 (or 2967465 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 44.

The square root of 2195891540 is about 46860.3408011508. The cubic root of 2195891540 is about 1299.7813320571.

The spelling of 2195891540 in words is "two billion, one hundred ninety-five million, eight hundred ninety-one thousand, five hundred forty".