1989524993 has 4 divisors (see below), whose sum is σ = 2031855360. Its totient is φ = 1947194628.

The previous prime is 1989524981. The next prime is 1989525049. The reversal of 1989524993 is 3994259891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1989524993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1989524923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21165113 + ... + 21165206.

It is an arithmetic number, because the mean of its divisors is an integer number (507963840).

Almost surely, 2^1989524993 is an apocalyptic number.

It is an amenable number.

1989524993 is a deficient number, since it is larger than the sum of its proper divisors (42330367).

1989524993 is an equidigital number, since it uses as much as digits as its factorization.

1989524993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42330366.

The product of its digits is 6298560, while the sum is 59.

The square root of 1989524993 is about 44604.0916620886. The cubic root of 1989524993 is about 1257.7175848843.

The spelling of 1989524993 in words is "one billion, nine hundred eighty-nine million, five hundred twenty-four thousand, nine hundred ninety-three".