1988356089 has 24 divisors (see below), whose sum is σ = 2746272576. Its totient is φ = 1279605600.

The previous prime is 1988356081. The next prime is 1988356147. The reversal of 1988356089 is 9806538891.

It is not a de Polignac number, because 1988356089 - 2³ = 1988356081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1988356081) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1818627 + ... + 1819719.

It is an arithmetic number, because the mean of its divisors is an integer number (114428024).

Almost surely, 2^1988356089 is an apocalyptic number.

It is an amenable number.

1988356089 is a deficient number, since it is larger than the sum of its proper divisors (757916487).

1988356089 is a wasteful number, since it uses less digits than its factorization.

1988356089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1789 (or 1758 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 57.

The square root of 1988356089 is about 44590.9866340721. The cubic root of 1988356089 is about 1257.4712213664.

The spelling of 1988356089 in words is "one billion, nine hundred eighty-eight million, three hundred fifty-six thousand, eighty-nine".