2145989972 has 12 divisors (see below), whose sum is σ = 4291980000. Its totient is φ = 919709976.

The previous prime is 2145989971. The next prime is 2145989977. The reversal of 2145989972 is 2799895412.

2145989972 is an admirable number.

It is a hoax number, since the sum of its digits (56) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145989971) 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 3 ways as a sum of consecutive naturals, for example, 38321222 + ... + 38321277.

It is an arithmetic number, because the mean of its divisors is an integer number (357665000).

Almost surely, 2^2145989972 is an apocalyptic number.

It is an amenable number.

2145989972 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2145989972 is a wasteful number, since it uses less digits than its factorization.

2145989972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76642510 (or 76642508 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 56.

The square root of 2145989972 is about 46324.8310520395. The cubic root of 2145989972 is about 1289.8599635661.

The spelling of 2145989972 in words is "two billion, one hundred forty-five million, nine hundred eighty-nine thousand, nine hundred seventy-two".