1968520387 has 4 divisors (see below), whose sum is σ = 1970171640. Its totient is φ = 1966869136.

The previous prime is 1968520357. The next prime is 1968520391. The reversal of 1968520387 is 7830258691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7830258691 = 59 ⋅132716249.

It is a cyclic number.

It is not a de Polignac number, because 1968520387 - 2⁷ = 1968520259 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1968520387.

It is not an unprimeable number, because it can be changed into a prime (1968520357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 823837 + ... + 826222.

It is an arithmetic number, because the mean of its divisors is an integer number (492542910).

Almost surely, 2^1968520387 is an apocalyptic number.

1968520387 is a deficient number, since it is larger than the sum of its proper divisors (1651253).

1968520387 is a wasteful number, since it uses less digits than its factorization.

1968520387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1651252.

The product of its (nonzero) digits is 725760, while the sum is 49.

The square root of 1968520387 is about 44368.0108524148. The cubic root of 1968520387 is about 1253.2757572593.

The spelling of 1968520387 in words is "one billion, nine hundred sixty-eight million, five hundred twenty thousand, three hundred eighty-seven".