1988945579 has 4 divisors (see below), whose sum is σ = 2003254680. Its totient is φ = 1974636480.

The previous prime is 1988945573. The next prime is 1988945597. The reversal of 1988945579 is 9755498891.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1988945579 - 2¹² = 1988941483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1988945573) 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, 7154342 + ... + 7154619.

It is an arithmetic number, because the mean of its divisors is an integer number (500813670).

Almost surely, 2^1988945579 is an apocalyptic number.

1988945579 is a deficient number, since it is larger than the sum of its proper divisors (14309101).

1988945579 is a wasteful number, since it uses less digits than its factorization.

1988945579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14309100.

The product of its digits is 32659200, while the sum is 65.

The square root of 1988945579 is about 44597.5961123467. The cubic root of 1988945579 is about 1257.5954770219.

The spelling of 1988945579 in words is "one billion, nine hundred eighty-eight million, nine hundred forty-five thousand, five hundred seventy-nine".