7985919540 has 48 divisors (see below), whose sum is σ = 22675524480. Its totient is φ = 2099583360.

The previous prime is 7985919533. The next prime is 7985919547. The reversal of 7985919540 is 459195897.

It is an interprime number because it is at equal distance from previous prime (7985919533) and next prime (7985919547).

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7985919547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 933055 + ... + 941574.

It is an arithmetic number, because the mean of its divisors is an integer number (472406760).

Almost surely, 2^7985919540 is an apocalyptic number.

It is an amenable number.

7985919540 is an abundant number, since it is smaller than the sum of its proper divisors (14689604940).

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

7985919540 is a wasteful number, since it uses less digits than its factorization.

7985919540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1874712 (or 1874710 counting only the distinct ones).

The product of its (nonzero) digits is 4082400, while the sum is 57.

The square root of 7985919540 is about 89363.9722707087. The cubic root of 7985919540 is about 1998.8259392589.

It can be divided in two parts, 79859 and 19540, that added together give a palindrome (99399).

The spelling of 7985919540 in words is "seven billion, nine hundred eighty-five million, nine hundred nineteen thousand, five hundred forty".