2193641540 has 24 divisors (see below), whose sum is σ = 4609631040. Its totient is φ = 876888288.

The previous prime is 2193641521. The next prime is 2193641543. The reversal of 2193641540 is 451463912.

It is a self number, because there is not a number n which added to its sum of digits gives 2193641540.

It is not an unprimeable number, because it can be changed into a prime (2193641543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3152 + ... + 66311.

It is an arithmetic number, because the mean of its divisors is an integer number (192067960).

Almost surely, 2^2193641540 is an apocalyptic number.

2193641540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2193641540 is an abundant number, since it is smaller than the sum of its proper divisors (2415989500).

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

2193641540 is a wasteful number, since it uses less digits than its factorization.

2193641540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71051 (or 71049 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 2193641540 is about 46836.3271403726. The cubic root of 2193641540 is about 1299.3372440303.

The spelling of 2193641540 in words is "two billion, one hundred ninety-three million, six hundred forty-one thousand, five hundred forty".